Tender and full of cinnamon flavor, these coffee cake muffins are just like your favorite coffee cake! Great for sharing or enjoying throughout the week.
Preheat oven to 400°F and lightly coat a 12-cup muffin pan with nonstick spray or fill with paper liners. Or, stagger cups in a 24-cup pan.
In a mixing bowl, mix together flour, baking powder, baking soda, and salt.
1 1/2 cups all-purpose flour, 1 teaspoon baking powder, 1/2 teaspoon baking soda, 1/2 teaspoon fine sea salt
In a large bowl, cream together granulated sugar and butter until fluffy. Beat in sour cream, eggs, and vanilla until smooth. Carefully mix the dry ingredients into the wet ingredients until fully incorporated. The batter will be somewhat thick.
8 tablespoons unsalted butter, 2/3 cup granulated sugar, 1 cup sour cream, 2 large eggs, 1 teaspoon pure vanilla extract
To make the streusel, in a small bowl stir together flour, brown sugar, and cinnamon, breaking up any sugar lumps. Stir in melted butter with a fork until large crumbs form.
1/3 cup all-purpose flour, 1/4 cup brown sugar, 1 1/4 teaspoon ground cinnamon, 2 tablespoons unsalted butter
Spoon half the batter into the prepared cups. Sprinkle on a teaspoon of streusel. Dollop on the remaining batter and spread over the streusel carefully. (It's fine if it does not cover the filling.) Sprinkle on the remaining streusel.
Bake for 5 minutes, then reduce heat to 350°F, and bake another 15 minutes, until a toothpick inserted into the center comes out with only moist crumbs.
Notes
Store in an airtight container at room temperature for up to 5 days, or freeze for up to 3 months.