Ultimate Cinnamon Crumb Coffee Cake (9 Cozy Slices)

This Cinnamon Crumb Coffee Cake is all about the topping — a thick, buttery layer of cinnamon crumb over a tender sour cream cake, with a second layer of crumb baked right into the middle. It’s the kind of cake that disappears fast at a brunch table.

Why You’ll Love This Cinnamon Crumb Coffee Cake

• Extra crumb, twice: a layer of streusel baked into the center and another piled on top means a crumb topping in every single bite.
• Tender crumb from sour cream: sour cream keeps the cake soft for days without drying out, even after it’s been sitting on the counter.
• Great for a crowd: it slices into 9 generous squares, perfect for a holiday brunch spread or a weekend coffee date. If you love a cozy spiced bake, our Spiced Apple Cake is another favorite in the same vein.

Ingredients You’ll Need

• Cold butter for the crumb — cut it into the dry crumb ingredients while still cold so it bakes up into distinct, craggy crumbs instead of melting flat.
• Brown sugar — used in both the crumb and the batter for a deeper, more caramel-like sweetness than granulated sugar alone.
• Ground cinnamon — the star of the crumb layer; use a fresh jar if yours has been sitting in the cabinet for years, since cinnamon loses potency over time.
• Sour cream — full-fat is best here; it’s what keeps this cake so moist and gives it a slight tang that balances the sweetness.
• Eggs, room temperature — they incorporate more smoothly into the batter and help the cake rise evenly.

How to Make Cinnamon Crumb Coffee Cake

1. Preheat the oven to 350°F. Grease an 8-inch square pan and line it with parchment paper, leaving an overhang on two sides.
2. Make the crumb topping: whisk 3/4 cup brown sugar, 3/4 cup flour, 1 tablespoon cinnamon, and 1/4 teaspoon salt together, then cut in 6 tablespoons cold, cubed butter with a fork or your fingers until you have pea-sized crumbs. Chill while you make the batter.
3. Whisk the dry ingredients: 1 1/2 cups flour, 1 1/2 teaspoons baking powder, 1/4 teaspoon baking soda, and 1/4 teaspoon salt.
4. Cream 1/2 cup softened butter with 3/4 cup granulated sugar for 2 to 3 minutes until light and fluffy.
5. Beat in 2 eggs one at a time, then 2 teaspoons vanilla extract.
6. Alternate adding the dry ingredients and 3/4 cup sour cream mixed with 2 tablespoons milk into the butter mixture in three additions, beginning and ending with the dry ingredients. Mix just until combined.
7. Layer half the batter in the prepared pan, sprinkle with half the crumb, spread the remaining batter on top, then finish with the rest of the crumb.
8. Bake for 38 to 42 minutes, until a toothpick inserted in the center comes out clean.
9. Cool in the pan for 15 minutes, then drizzle with a glaze of 1 cup powdered sugar whisked with 2 to 3 tablespoons milk and 1/2 teaspoon vanilla while still slightly warm.

Tips for Perfect Cinnamon Crumb Coffee Cake

Keep the crumb butter cold. Warm or melted butter makes the crumb topping bake flat instead of staying crumbly. If your kitchen is warm, chill the mixed crumb for 10 minutes before using.

Don’t overmix once the flour goes in. Overmixing develops gluten and makes the cake tough instead of tender. Stop as soon as you no longer see streaks of flour.

Let it cool before glazing. Glaze poured over a hot cake melts into a thin, disappearing layer instead of a visible drizzle. Fifteen minutes of cooling is the sweet spot.

Variations to Try

• Apple-cinnamon version: fold 1 cup finely diced apple into the batter for a fall twist, or bake our Spiced Apple Cake instead for an apple-forward option.
• Spiced loaf swap: if you’re craving a loaf instead of a square cake, our Gingerbread Loaf has a similar cozy spice profile.
• Nutty crumb: stir 1/3 cup chopped pecans or walnuts into the crumb topping before baking.
• Skip the glaze: for a less sweet finish, leave the cake unglazed and dust with powdered sugar instead.

What to Serve With Cinnamon Crumb Coffee Cake

This cake is built for coffee — serve it warm alongside a strong cup or a spiced latte for a weekend breakfast. For a fall brunch spread with more spice-forward options, set it next to our Chai Spice Cupcakes.

It also holds its own as a simple afternoon dessert with a scoop of vanilla ice cream, especially once it’s had a day to sit and the flavors settle.

FAQs

Can I make this cinnamon crumb coffee cake ahead of time? Yes — bake it up to 2 days ahead, keep it covered at room temperature, and add the glaze just before serving for the freshest look.

How do I store cinnamon crumb coffee cake? Store covered at room temperature for up to 3 days, or refrigerate for up to a week. Let it come to room temperature before serving.

Can I use a 9-inch round pan instead of a square pan? Yes, the bake time is similar, though check for doneness starting around 35 minutes since round pans can bake slightly faster.

Can I freeze this cake? Yes — freeze the unglazed cake tightly wrapped for up to 3 months. Thaw at room temperature and glaze before serving.

Final Thoughts

A good coffee cake should be more crumb than cake, and this one delivers with a layer baked into the middle and a generous pile on top. It’s simple enough for a weekday morning but special enough for a holiday brunch table.

I hope this becomes a regular in your baking rotation. Let me know how yours turns out, and if you’re in the mood for more cozy fall bakes, there are plenty more to try.