Easy & Irresistible Bake Coffee Cake with Amazing Crumb Topping

Instructions:

1. Preheat the oven to 350°F (175°C). Grease the baking dish.
2. In a mixing bowl, whisk together flour, baking powder, baking soda, salt, and cinnamon.
3. In a separate bowl, cream together butter and granulated sugar until light and fluffy (about 3-4 minutes).
4. Add eggs, one at a time, mixing well after each addition. Beat in sour cream and vanilla extract.
5. Gradually add dry ingredients to the wet mixture until just combined. Do not overmix.
6. Pour half the batter into the prepared baking dish. Sprinkle with cinnamon sugar (to taste).
7. Pour on the remaining batter and level with a spatula.
8. In a new bowl, combine crumb topping ingredients until crumbly. Sprinkle generously over the cake.
9. Bake for 35-40 minutes or until a toothpick inserted into the center comes out clean.
10. Let cool in the pan for 10 minutes, then transfer to a cooling rack to cool completely before serving.