Step 1

Preheat the oven to 375° F. Line a 12-cup muffin tin with liners or grease with cooking spray and set it aside.

Step 2

To make the streusel, mix the flour, light brown sugar, ground cinnamon, and salt. Add the melted butter and stir until crumbly. Refrigerate until ready to use.

Step 3

In a medium-sized bowl or large liquid measuring cup, whisk the buttermilk, {lightly beaten} eggs, and vanilla extract until combined.

Step 4

Whisk the flour, ground cinnamon, sugar, baking powder, and salt together in a large bowl.

Step 5

Stir the buttermilk-egg mixture and melted butter into the dry ingredients, being careful not to over-mix the batter.

Step 6

Scoop the batter into the prepared muffin tin, filling each cup a little less than halfway. Sprinkle 1 to 2 teaspoon of streusel into each cup. Cover with remaining muffin batter. Divide the remaining streusel on top of each muffin.

Step 7

Bake the muffins for 20-25 minutes, or until a toothpick inserted in the center comes out with a few crumbs.