Almond Streusel Coffee Cake with Buttery Crumble Topping

Why You’ll Love This Recipe

• A thick, golden almond streusel that bakes into crunchy, buttery clusters.
• A tender, moist vanilla crumb thanks to sour cream and a touch of oil.
• Simple pantry ingredients, but the flavor tastes bakery-level special.
• Perfect for brunch, coffee breaks, or making ahead for guests.

Grocery List

• Produce: 1 lemon (for zest, optional but lovely)
• Dairy: Unsalted butter, sour cream, whole milk, eggs
• Pantry: All-purpose flour, granulated sugar, light brown sugar, powdered sugar, sliced almonds, neutral oil, baking powder, baking soda, fine salt, ground cinnamon, vanilla extract, almond extract

Full Ingredients

For the Almond Streusel

• 1 cup (140 g) all-purpose flour
• 2/3 cup (135 g) packed light brown sugar
• 1/3 cup (67 g) granulated sugar
• 1/2 tsp ground cinnamon
• 1/4 tsp fine sea salt
• 1/2 cup (113 g) unsalted butter, melted and slightly cooled
• 1 tsp pure vanilla extract
• 1/2 tsp pure almond extract (optional but recommended)
• 1 cup (90 g) sliced almonds, untoasted or lightly toasted

For the Vanilla Coffee Cake

• 2 1/4 cups (280 g) all-purpose flour, spooned and leveled
• 2 tsp baking powder
• 1/2 tsp baking soda
• 1/2 tsp fine sea salt
• 1/2 cup (113 g) unsalted butter, softened to room temperature
• 1/2 cup (100 g) packed light brown sugar
• 2/3 cup (135 g) granulated sugar
• 1/4 cup (60 ml) neutral oil (such as canola, vegetable, or grapeseed)
• 3 large eggs, at room temperature
• 2 tsp pure vanilla extract
• 1/2 tsp pure almond extract
• 1 tsp finely grated lemon zest (optional, for brightness)
• 1 cup (240 ml) full-fat sour cream, at room temperature (or thick full-fat Greek yogurt)
• 1/4 cup (60 ml) whole milk, at room temperature

Optional Almond-Vanilla Glaze

• 1 cup (120 g) powdered sugar, sifted
• 2–3 tbsp whole milk or cream
• 1/2 tsp pure vanilla extract
• 1/4 tsp pure almond extract
• Pinch of fine sea salt

Step-by-Step Instructions

Step 1: Prepare the pan, oven, and almonds

Preheat your oven to 350°F (175°C) with a rack in the center. Lightly grease a 9×13-inch baking pan with butter or nonstick spray. For extra easy removal and clean slices, line the bottom and two long sides with a sheet of parchment paper, leaving an overhang as a sling; lightly grease the parchment as well.

If you like a deeper nutty flavor, lightly toast the sliced almonds: spread them in a single layer on a baking sheet and toast in the preheating oven for 5–7 minutes, shaking the pan once, until just fragrant and barely golden at the edges. Let them cool while you start the streusel.

Step 2: Make the almond streusel crumble

In a medium bowl, whisk together the flour, brown sugar, granulated sugar, cinnamon, and salt until no lumps of sugar remain. Pour in the melted butter, vanilla extract, and almond extract. Stir with a fork or spatula until the mixture is evenly moistened and starts to form clumps.

Fold in the sliced almonds. Use your fingers to squeeze and crumble the mixture into large and small clusters. You want a mix of pea-sized pieces and bigger chunks for texture. Set the streusel aside at room temperature; it will firm up slightly as it stands, which helps it bake into crisp, crackly clusters.

Step 3: Mix the dry ingredients for the cake

In a separate medium bowl, whisk together the flour, baking powder, baking soda, and salt until well combined. This step distributes the leavening evenly and helps prevent overmixing later. Set the bowl aside.

Step 4: Cream the butter, sugars, and eggs

In a large mixing bowl (or the bowl of a stand mixer fitted with the paddle attachment), beat the softened butter, brown sugar, and granulated sugar on medium speed for 2–3 minutes, until the mixture looks lightened in color and slightly fluffy. Scrape down the sides of the bowl.

Stream in the neutral oil and beat for another 30–60 seconds until smooth. Add the eggs one at a time, beating well after each addition and scraping the bowl as needed. Mix in the vanilla extract, almond extract, and optional lemon zest just until combined. The mixture should look creamy and emulsified.

Step 5: Add dry ingredients, sour cream, and milk

Add about one-third of the flour mixture to the bowl and mix on low just until the dry bits are nearly incorporated. Add half of the sour cream and mix gently. Continue alternating: add another third of the flour, then the remaining sour cream, then the last third of the flour, mixing on low after each addition.

Finally, pour in the milk and mix on low until the batter is smooth and thick, with no visible dry pockets of flour. Do not overbeat; stop as soon as everything is evenly combined. The batter should be spreadable but not runny.

Step 6: Layer the batter and almond streusel

Give the batter a final stir by hand to ensure everything from the bottom of the bowl is incorporated. Spread about half of the batter into the prepared pan, smoothing it into an even layer with an offset spatula or the back of a spoon. It will be a fairly thick layer; try to get it as level as you can.

Sprinkle about one-third of the almond streusel evenly over this first layer. Dollop the remaining batter over the streusel in spoonfuls, then gently spread it into an even layer, taking care not to disturb the streusel too much. Scatter the remaining streusel evenly over the top, breaking up any very large clumps so they bake through. You should have a generous, thick streusel blanket covering the surface.

Step 7: Bake, cool, and (optionally) glaze

Bake the cake in the preheated oven for 35–40 minutes, or until the top is deep golden and a toothpick or thin skewer inserted into the center comes out with a few moist crumbs but no wet batter. If the streusel is browning too quickly near the end, tent the pan loosely with foil.

Transfer the pan to a wire rack and let the cake cool for at least 20–30 minutes. It will slice more cleanly as it cools, but it is delicious slightly warm.

For the optional glaze, whisk together the powdered sugar, 2 tablespoons milk or cream, vanilla, almond extract, and a pinch of salt until smooth and pourable. Add a few drops more milk if needed to thin. Drizzle the glaze over the cooled or slightly warm cake in thin zigzags. Lift the cake from the pan using the parchment sling (if used), slice into 12 squares, and serve.

Pro Tips

• Measure flour accurately: For the best texture, weigh your flour or use the spoon-and-level method. Too much flour makes the cake dense and dry.
• Room-temperature ingredients: Bring butter, eggs, sour cream, and milk to room temperature so the batter mixes smoothly and bakes evenly.
• Clumpy streusel is good streusel: When mixing the topping, gently squeeze it into clusters. Those big, craggy bits bake into the most satisfying crunchy pieces.
• Do not overbake: Start checking at 33–35 minutes. Pull the cake as soon as a tester comes out mostly clean. Overbaking will dry out the tender crumb.
• Let it rest before slicing: The crumb sets as it cools. If you slice it piping hot, it may seem too soft; after 20–30 minutes, it holds together beautifully.

Variations

• Blueberry Almond Coffee Cake: Gently fold 1 1/2 cups fresh or frozen blueberries (no need to thaw) into the finished batter. Sprinkle a few extra berries on top under the streusel for pops of color.
• Extra-Nutty Version: Swap half of the sliced almonds for chopped toasted hazelnuts or pecans, and add an extra 1/4 tsp almond extract to the streusel for a more intense nutty aroma.
• Gluten-Free Adaptation: Use a high-quality 1:1 gluten-free all-purpose flour blend in both the streusel and cake. Let the baked cake cool completely before slicing to help it set.

Storage & Make-Ahead

Once completely cool, cover the cake tightly in the pan or transfer slices to an airtight container. Store at room temperature for up to 2 days, or in the refrigerator for up to 5 days. For longer storage, wrap individual slices tightly in plastic wrap, then place in a freezer bag and freeze for up to 2–3 months. Thaw at room temperature or gently rewarm in a 300°F (150°C) oven for 10–15 minutes.

You can also make the streusel up to 2 days ahead: keep it in an airtight container in the refrigerator, then break it into clumps before using. The baked cake is an excellent make-ahead option for brunch; bake it the day before, cool completely, cover tightly, and add the glaze shortly before serving.

Nutrition (per serving)

Approximate values for 1 of 12 servings (without glaze): about 430 calories, 23 g fat, 9 g saturated fat, 52 g carbohydrates, 2 g fiber, 29 g sugars, 7 g protein, and 260 mg sodium. With glaze, add roughly 40–50 calories and 9–10 g sugar per serving. These numbers are estimates and will vary based on specific ingredients and portion sizes.