Sour Cream Apple Coffee Cake

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Coffee cake should be tender enough to crumble slightly when you bite into it, but not so delicate that it falls apart on the plate. It should have distinct layers—cake, apples, streusel—that stay separate but work together. And it should taste good enough that you eat it for breakfast without any guilt.

This version uses sour cream to keep the cake moist and tender for days. Fresh apples add texture and a slight tartness that keeps it from being too sweet. The brown sugar streusel provides crunch and that essential cinnamon flavor. It’s the kind of cake you make on Sunday and eat all week.

What You’ll Need

For the Streusel:

¾ cup all-purpose flour
½ cup packed light brown sugar
1½ teaspoons ground cinnamon
¼ teaspoon kosher salt
6 tablespoons unsalted butter, melted
½ cup chopped pecans or walnuts (optional)

For the Cake:

2 cups all-purpose flour
1 teaspoon baking powder
½ teaspoon baking soda
½ teaspoon kosher salt
½ cup (1 stick) unsalted butter, softened
¾ cup granulated sugar
2 large eggs, room temperature
2 teaspoons vanilla extract
1 cup sour cream, room temperature
2 medium apples (Granny Smith or Honeycrisp), peeled and diced
1 tablespoon granulated sugar
½ teaspoon ground cinnamon

For the Glaze (Optional):

½ cup powdered sugar
1-2 tablespoons milk
¼ teaspoon vanilla extract

Tools:

9-inch springform pan or 9×9-inch square baking pan
Large mixing bowl
Medium mixing bowl (2)
Small bowl
Electric mixer or whisk
Spatula
Vegetable peeler
Chef’s knife
Measuring cups and spoons
Wire cooling rack

Making the Streusel

In a small bowl, combine the flour, brown sugar, cinnamon, and salt. Stir to mix.

Pour in the melted butter and stir with a fork until the mixture forms large, clumpy crumbs. If using nuts, fold them in now.

Set aside.

Preparing the Apples

In another small bowl, toss the diced apples with 1 tablespoon of sugar and ½ teaspoon of cinnamon. Set aside.

This step prevents the apples from sinking to the bottom and adds extra flavor.

Making the Cake

Preheat your oven to 350°F. Grease your pan thoroughly with butter or cooking spray. If using a springform pan, line the bottom with parchment paper.

In one medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.

In your large bowl, beat the softened butter and sugar with an electric mixer on medium speed for about 3 minutes until light and fluffy.

Add the eggs one at a time, beating well after each addition. Beat in the vanilla extract.

Add half of the dry ingredients and mix on low speed just until combined. Add the sour cream and mix until incorporated. Add the remaining dry ingredients and mix just until no flour streaks remain. Don’t overmix.

The batter will be thick. That’s what you want.

Assembling

Spread half of the batter into your prepared pan. It will be a thin layer.

Scatter half of the cinnamon-coated apples over the batter.

Sprinkle half of the streusel over the apples.

Carefully spread the remaining batter over the streusel layer. You can drop it in spoonfuls and gently spread it—it doesn’t have to be perfect.

Top with the remaining apples, then finish with the rest of the streusel. Make sure you cover the surface well.

Baking

Bake for 50-60 minutes. The cake is done when a toothpick inserted into the center comes out with just a few moist crumbs and the streusel is deep golden brown.

If using a springform pan, place it on a baking sheet to catch any drips.

If the top browns too quickly, tent loosely with foil for the last 15 minutes.

Cooling and Glazing

Let the cake cool in the pan on a wire rack for at least 20 minutes.

If using a springform pan, run a knife around the edge before releasing the sides. If using a square pan, you can serve directly from the pan.

For the optional glaze, whisk together the powdered sugar, milk, and vanilla in a small bowl. The glaze should be thick but pourable. Drizzle it over the cooled cake in a zigzag pattern.