Cardamom Crumb Cake with Brown Sugar Streusel

Cardamom crumb cake is a tender coffee cake with warm ground cardamom, a buttery brown-sugar streusel, and a soft vanilla crumb. The spice gives the cake a floral, citrusy aroma that feels special without being unfamiliar. Bake it in a square pan, slice it into generous pieces, and serve it for breakfast, brunch, or an afternoon snack.

This version keeps the cake moist with sour cream and uses a thick topping that stays crumbly instead of melting into the batter. The streusel can be made first, and the rest of the recipe mixes by hand with no mixer required.

Why you'll love this cardamom crumb cake

• Soft and moist: Sour cream keeps the crumb tender for several days.
• Fragrant but balanced: Cardamom adds character while vanilla and brown sugar keep the flavor cozy.
• Generous streusel: Every slice gets a buttery, cinnamon-speckled topping.
• Simple method: The batter comes together in one bowl with a whisk and spatula.
• Flexible serving: Enjoy it plain, dusted with sugar, or finished with a thin glaze.

For a fruit-filled morning bake, try our easy blueberry cobbler. If you prefer a taller, buttery cake, our crunchy top pound cake has a different but equally comforting texture.

Ingredients for cardamom crumb cake

For the streusel

• 3/4 cup all-purpose flour
• 1/2 cup packed light brown sugar
• 1 teaspoon ground cardamom
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon fine salt
• 6 tablespoons unsalted butter, melted and slightly cooled

For the cake

• 1 3/4 cups all-purpose flour
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon fine salt
• 1 1/2 teaspoons ground cardamom
• 1/2 cup unsalted butter, softened
• 3/4 cup granulated sugar
• 2 large eggs, room temperature
• 2 teaspoons vanilla extract
• 3/4 cup full-fat sour cream
• 1/3 cup whole milk

Optional glaze

• 3/4 cup powdered sugar
• 1 1/2 tablespoons milk or cream
• 1/2 teaspoon vanilla extract

Freshly ground cardamom has the brightest flavor, but a good ground spice works well. If you grind cardamom pods yourself, remove the green husks and use only the tiny black seeds. Full-fat sour cream gives the richest crumb; plain Greek yogurt can be substituted with a slightly tangier result.

This cake contains wheat, eggs, and dairy. Keep it covered after cooling, and use clean utensils if serving guests with food allergies. For baking and handling egg-containing foods, the USDA egg-safety guidance is a useful reference.

How do you make cardamom crumb cake?

1. Heat the oven. Set the oven to 350°F. Grease an 8-inch square baking pan and line it with parchment, leaving an overhang for easy lifting.
2. Make the streusel. Whisk flour, brown sugar, cardamom, cinnamon, and salt. Stir in the melted butter until large, damp crumbs form. Refrigerate the bowl while you mix the batter.
3. Combine the dry ingredients. In a medium bowl, whisk flour, baking powder, baking soda, salt, and cardamom.
4. Cream the butter and sugar. In a large bowl, whisk softened butter and granulated sugar for 1 to 2 minutes until smooth. Add the eggs one at a time, then whisk in vanilla.
5. Add the dairy. Stir in the sour cream. Add half the dry mixture, then the milk, then the remaining dry mixture. Fold just until no flour streaks remain.
6. Layer the pan. Spread the thick batter in the prepared pan. Scatter the chilled streusel evenly over the top and press it very lightly so it adheres.
7. Bake. Bake for 38 to 46 minutes, until the center springs back and a toothpick inserted through the cake comes out with a few moist crumbs.
8. Cool and glaze. Cool in the pan for 20 minutes, then lift to a rack. Whisk the glaze ingredients and drizzle over the fully cooled cake.

Do not swirl the streusel deeply into the batter. Keeping it on top creates the classic crumb-cake contrast and prevents the brown sugar from sinking into the center.

Tips for a moist, fluffy crumb

• Bring ingredients to room temperature: Eggs, butter, sour cream, and milk blend more evenly when they are not cold.
• Do not overmix: Stop stirring as soon as the flour disappears.
• Use the right pan: An 8-inch square pan gives the cake enough height for a thick crumb layer.
• Check early: Ovens vary, so start checking at 38 minutes.
• Cool before cutting: Warm cake can seem underdone even when the crumb will set as it cools.
• Keep the glaze thin: A light drizzle adds sweetness without hiding the cardamom.

If your streusel looks sandy rather than clumpy, add another teaspoon of melted butter. If it looks greasy, stir in a tablespoon of flour. The finished crumbs should hold together when squeezed but break apart easily when scattered.

Flavor variations

• Orange cardamom: Add 1 tablespoon orange zest to the batter and use orange juice in the glaze.
• Pear version: Fold 1 cup finely diced firm pear into the batter and reduce the milk by 1 tablespoon.
• Almond topping: Add 1/3 cup sliced almonds to the streusel.
• Chocolate chip: Fold 1/2 cup mini semisweet chocolate chips into the finished batter.
• Maple glaze: Replace the milk in the glaze with 1 tablespoon maple syrup plus 1 teaspoon milk.
• Berry layer: Scatter 3/4 cup blueberries over the batter before adding the streusel.

For a peach-forward dessert, explore our fresh peach recipes. A more deeply fruit-filled option is our blackcurrant crumble cake, which also pairs well with tea.

How should you store the cake?

Store the cooled cake in an airtight container at room temperature for up to 3 days. If your kitchen is warm, refrigerate it, but bring slices to room temperature before serving so the butter in the crumb softens.

Freeze the cake without glaze for up to 2 months. Wrap the whole cake or individual squares tightly, then thaw at room temperature. Add fresh glaze once the cake is fully thawed.

Frequently asked questions

What does cardamom taste like in cake?

Cardamom has a warm, floral flavor with gentle citrus and eucalyptus-like notes. It is fragrant rather than hot, and it pairs especially well with vanilla, brown sugar, orange, and pear.

Can I make cardamom crumb cake without sour cream?

Yes. Use full-fat plain Greek yogurt or buttermilk. If using buttermilk, reduce the amount to 1/2 cup and omit the whole milk.

Why is my crumb topping sinking?

The batter may have been too thin, the crumbs may have been pressed down too deeply, or the cake may have needed a little more baking time. Keep the topping on the surface and check the center before removing the cake.

Can I bake this in a 9-inch round pan?

Yes, but the cake will be slightly thinner. Start checking after 32 minutes and remove it when a toothpick shows a few moist crumbs.

Can I make the batter ahead?

It is best to bake the batter soon after mixing because the leaveners begin working right away. You can make the streusel up to 3 days ahead and refrigerate it.

Conclusion

This cardamom crumb cake is tender, warmly spiced, and covered with buttery brown-sugar crumbs. Keep the batter lightly mixed, chill the streusel, and let the cake cool before glazing. It is a simple bake that makes an ordinary morning feel a little more generous.