1-First Step: Preheat your oven to 350°F and grease a 9×13-inch baking pan with butter or cooking spray. Line with parchment if you like easy removal. This setup ensures even baking and no sticking for your coffee cake recipe cinnamon swirl.

2-Second Step: In a large bowl, whisk together 2 cups flour, 1 cup sugar, 1 tsp baking powder, and 1/2 tsp salt. Add 1/2 cup softened butter, 2 eggs, 1 cup sour cream, and 1 tsp vanilla. Beat with a hand mixer on medium speed for 2-3 minutes until smooth and creamy. Scrape sides often.

3-Third Step: In a medium bowl, combine 1/2 cup flour, 1/2 cup brown sugar, 1/4 cup cold butter, and 1 tsp cinnamon. Use a fork or fingers to cut in butter until crumbly pea-sized bits form. Takes 2 minutes max.

4-Fourth Step: Spread half the batter evenly in the prepared pan it’s thick, so use a spatula. Sprinkle half the streusel over it, pressing lightly. Top with remaining batter, then finish with rest of streusel.

5-Fifth Step: Bake at 350°F for 35-45 minutes. Check at 35 by inserting a toothpick in center it should come out clean or with moist crumbs. Edges pull from pan when done.

6-Final Step: Dust with powdered sugar, slice into squares, and serve warm. Pairs great with brunch like a refreshing Caesar salad. Store leftovers as below. Enjoy the aroma filling your home!