What makes sour cream coffee cake so moist?

The sour cream adds fat and acid, which tenderizes the flour and helps retain moisture for days after baking.

Can I freeze Sour Cream Coffee Cake (with Crumb Topping)?

Yes! Wrap it tightly in plastic and freeze for up to 2 months. Thaw at room temp or reheat briefly in the microwave.

While sour cream is ideal, you can use plain Greek yogurt as a 1:1 substitute. It will be slightly less rich but still moist.

Either works! It’s delicious warm with melting crumbs, or cooled for denser texture. Personal preference wins here.

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Preheat oven to 350°F and grease a 9-inch square baking pan.
Cream butter and sugar until light and fluffy. Add eggs one at a time, then vanilla.
Mix dry ingredients separately. Add alternately with sour cream to wet mix.
In another bowl, combine crumb topping ingredients using a fork or hands until crumbly.
Pour batter into pan and top with crumb mixture.
Bake for 35–40 minutes or until toothpick comes out clean.
Cool slightly before slicing. Serve warm or at room temp.