This easy Cinnamon Streusel Coffee Cake is made from scratch with a sweet cinnamon-sugar layer baked inside—perfect for breakfast, brunch, or a cozy weekend treat.
Cream sugar and butter together in a large bowl using an electric mixer until light and fluffy.
Beat in eggs one at a time, ensuring each is well incorporated. Mix in vanilla.
In a separate bowl, whisk together flour, baking soda, and baking powder.
Gradually add this mixture to the butter mixture in two parts, alternating with sour cream, briefly mixing after each addition.
Pour half of the batter into the greased bundt pan.
Combine sugar and cinnamon in a small bowl, then sprinkle this mixture over the batter in the pan.
Add the remaining batter in heaping spoonfuls over the filling, covering it as best as possible.
Bake in a preheated oven at 350ºF until a toothpick inserted into the center comes out clean, for 40 to 50 minutes.
Allow the cake to cool on a wire rack for 5 minutes, then carefully invert it onto a serving plate or cooling rack.
Let it cool completely.
While the cake is cooling, add the powered sugar and milk into a mixing bowl and whisk until smooth. drizzle the glaze over the cooled cake.
Slice and enjoy!
Notes
Grease thoroughly: Use butter or non-stick spray, making sure to coat every curve and corner of the pan to prevent sticking. I like to use Pam Non-Stick Baking Spray with Flour. Tap out air bubbles: Gently tap the pan on the counter a few times to release any trapped air.Cool properly: Let the cake cool in the pan for 10–15 minutes before inverting it onto a wire rack to finish cooling.Loosen edges if needed: Use a small offset spatula or butter knife to gently loosen the edges before turning the cake out.Clean carefully: Use a soft brush or sponge to clean between the grooves—avoid anything too abrasive that could scratch the non-stick surface.