Coffee Cake Donuts with Vanilla Glaze

Ingredients

For the crumb topping:

1/4 stick cold unsalted butter, cut into tiny cubes

1/4 cup granulated sugar

3 and 1/2 tablespoons all-purpose flour

1/4 teaspoon cinnamon

For the donuts:

1 cup all-purpose flour

1/2 cup light brown sugar, packed

1/2 teaspoon salt

1 teaspoon baking powder

1/2 cup full-fat sour cream

2 1/2 tablespoons unsalted butter, melted

1 large egg, at room temperature

For the vanilla glaze:

1/2 cup confectioners’ sugar

1/2 tablespoon whole milk

1/2 teaspoon vanilla extract