Cinnamon Streusel Coffee Cake with Vanilla Glaze

Why You’ll Love This Recipe

• Tender, buttery sour-cream crumb with a generous cinnamon ribbon through the center.
• Thick, crunchy streusel on top—big craggly clumps that stay crisp.
• Quick vanilla glaze adds a delicate, bakery-style finish.
• Easy layering method; everything mixes by hand or with a basic mixer.

Grocery List

• Produce: None
• Dairy: Unsalted butter, sour cream, milk
• Pantry: All-purpose flour, granulated sugar, light brown sugar, powdered sugar, baking powder, baking soda, ground cinnamon, fine salt, vanilla extract, optional chopped pecans or walnuts

Full Ingredients

For the crunchy streusel topping

• 1 3/4 cups (220 g) all-purpose flour
• 1/2 cup (100 g) granulated sugar
• 1/2 cup (110 g) packed light brown sugar
• 1 1/2 teaspoons ground cinnamon
• 1/2 teaspoon fine salt
• 10 tablespoons (140 g) unsalted butter, melted and cooled 5 minutes
• Optional: 1/2 cup (55 g) chopped toasted pecans or walnuts

For the cinnamon ribbon

• 2/3 cup (140 g) packed light brown sugar
• 1 1/2 tablespoons ground cinnamon
• 1 tablespoon all-purpose flour
• Pinch fine salt

For the tender sour-cream cake

• 2 1/4 cups (281 g) all-purpose flour
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon fine salt
• 1/2 cup (113 g) unsalted butter, softened
• 3/4 cup (150 g) granulated sugar
• 1/4 cup (55 g) packed light brown sugar
• 2 large eggs, at room temperature
• 2 teaspoons pure vanilla extract
• 1 cup (240 g) full-fat sour cream, at room temperature
• 1/4 cup (60 ml) whole milk, at room temperature

For the light vanilla glaze

• 3/4 cup (90 g) powdered sugar
• 1–2 tablespoons milk (to thin)
• 1/2 teaspoon pure vanilla extract
• Pinch fine salt

Step-by-Step Instructions

Step 1: Prep the pan and preheat

Heat the oven to 350°F (177°C) with a rack in the center. Grease a 9×13-inch metal baking pan and line it with a parchment sling (overhang on the long sides) for easy lifting. Lightly grease the parchment as well.

Step 2: Make the crunchy streusel

In a medium bowl, whisk the flour, granulated sugar, brown sugar, cinnamon, and salt. Stir in the melted butter until large, moist clumps form; mix in nuts if using. Aim for a mix of pea- to walnut-sized pieces. Refrigerate while you continue—cold streusel bakes up crunchier.

Step 3: Stir together the cinnamon ribbon

In a small bowl, combine brown sugar, cinnamon, flour, and a pinch of salt. The flour helps keep the ribbon from sinking and melting into the cake. Set aside.

Step 4: Mix the cake batter

In a large bowl (or stand mixer), beat the softened butter with the granulated and brown sugar until light and fluffy, 2–3 minutes. Beat in the eggs one at a time, then the vanilla. In a separate bowl, whisk the flour, baking powder, baking soda, and salt. Add the dry ingredients in two additions, alternating with the sour cream and milk. Mix just until smooth and no dry spots remain—do not overmix.

Step 5: Layer the batter and cinnamon ribbon

Spread half the batter evenly in the prepared pan (an offset spatula helps). Sprinkle all of the cinnamon ribbon evenly over the surface, reaching the edges. Dollop the remaining batter over the ribbon in small scoops, then gently spread to cover. For a defined ribbon, do not over-swirl; one or two light passes with a knife are enough.

Step 6: Add the streusel topping

Break up any overly large chilled streusel clumps and scatter evenly over the batter, pressing very lightly so it adheres. You should have a thick, bumpy layer edge-to-edge.

Step 7: Bake

Bake for about 42 minutes (check at 38). The cake is done when the top is golden-brown, the center springs back, and a toothpick inserted near the center (avoid the ribbon seam) comes out clean or with a few moist crumbs. Internal temperature will be around 200–205°F (93–96°C).

Step 8: Cool, glaze, and serve

Cool the cake in the pan on a rack for 20 minutes. Whisk the powdered sugar, milk, vanilla, and a pinch of salt until smooth, then drizzle over the warm cake in zigzags. Let the glaze set 10 minutes. Lift out using the parchment and slice into 12 squares. Serve warm or at room temperature.

Pro Tips

• Keep the streusel cold until it goes on the cake—chilled clumps bake up crunchier.
• Dollop the top batter layer in several piles and spread gently; this keeps the cinnamon ribbon from dragging.
• Use room-temperature dairy and eggs for a smooth, lump-free batter and even rise.
• Test doneness in multiple spots around the center to avoid hitting the gooey ribbon.
• For clean slices, let the cake cool to just warm and use a serrated knife with a gentle sawing motion.

Variations

• Nutty Streusel: Add 1/2 cup (55 g) chopped toasted pecans or walnuts to the streusel and a pinch of cardamom for warmth.
• Blueberry Ribbon: Toss 1 cup (150 g) blueberries with 1 teaspoon flour and sprinkle over the cinnamon ribbon before adding the top batter; bake 5 minutes longer if needed.
• Apple-Cinnamon: Scatter 1 1/2 cups (180 g) finely diced peeled apple over the ribbon; bake an extra 5–10 minutes until done.

Storage & Make-Ahead

Store tightly covered at room temperature for up to 3 days, or refrigerate up to 5 days. Rewarm slices in the microwave for 10–15 seconds to refresh the crumb. Freeze well-wrapped slices (or the whole cake) for up to 2 months; thaw at room temperature, then refresh at 300°F (150°C) for 8–10 minutes if desired. For make-ahead prep, mix the streusel and ribbon up to 3 days in advance and refrigerate; make the batter just before baking for best rise.

Nutrition (per serving)

Approx. 560 calories; 24 g fat; 80 g carbohydrates; 6 g protein; 3 g fiber; 41 g sugars; 370 mg sodium. Calculated without optional nuts; values are estimates.