These moist coffee cake muffins combine everything you love about a classic coffee cake into a handheld, bakery-style muffin. Each muffin features a tender crumb, a cinnamon swirl streusel layer in the center, a generous crumb topping, and a light vanilla glaze that makes them perfect for breakfast or brunch.
In a medium bowl, combine brown sugar, flour, cinnamon, and salt. Stir in melted butter until coarse crumbs form and set it aside.
Make the Muffin Batter
In a large bowl or stand mixer fitted with the paddle attachment, cream butter and granulated sugar until light and fluffy, about 2–3 minutes.
Add eggs one at a time, mixing well after each addition. Stir in vanilla extract.
In a separate bowl, whisk together flour, baking powder, baking soda, and salt.
Add dry ingredients to the batter in two additions, alternating with sour cream. Mix just until combined. Do not overmix.
Assemble the Muffins
Preheat oven to 400°F. Line a large muffin tin with paper liners and lightly spray if desired.
For each muffin cup:* Add ¼ cup batter* Sprinkle 2 tablespoons streusel* Add another ¼ cup batter* Finish with 2 tablespoons streusel, gently pressing it in so the muffin cup is about 3/4 full.
Baking Instructions
Bake at 400°F for 8 minutes. Without opening the oven door, reduce the temperature to 350°F. Continue baking 20–22 minutes, or until a toothpick inserted into the center comes out clean.
Add the Icing Drizzle
In a small bowl, whisk powdered sugar, milk, vanilla, and salt until smooth. Drizzle over completely cooled muffins. Drizzle over completely cooled muffins.
Notes
Greek Yogurt Substitute: Full-fat Greek yogurt can replace sour cream 1:1. If the batter feels thick, add 1 tablespoon of milk.
Do Not Overmix: Overmixing leads to dense muffins and sinking streusel.
For Taller Muffin Tops: Chill assembled muffins for 10 minutes before baking.
Storage: Store in an airtight container at room temperature for 2 days, refrigerate up to 5 days, or freeze un-iced muffins up to 2 months.