• Cinnamon Streusel
• 1 1/3 cups all-purpose flour
• 3/4 cup light brown sugar packed
• 1 tablespoon cinnamon
• 1/2 teaspoon nutmeg
• 3/4 cup butter melted
• Cake
• 1/2 cup butter room temperature
• 1 cup sugar
• 2 large eggs
• 1 teaspoon pure vanilla extract
• 1 cup all-purpose flour
• 1/2 teaspoon baking powder
• 1 teaspoon cinnamon
• 1/2 cup sour cream

Cinnamon Streusel

• Combine the flour, brown sugar, cinnamon, nutmeg, and butter in a medium bowl. Mix together with a fork until clumps are formed.

Cake

• Preheat oven to 350° F. and grease a 9 X 9-inch pan with butter.
• In a medium mixing bowl, whisk together the flour, baking powder, and cinnamon.
• In a large mixing bowl, cream together the butter and sugar until light and fluffy, approximately 3 to 4 minutes.
• Add the eggs and vanilla and mix well, scraping down the sides of the bowl as needed.
• Add the flour mixture.
• Add the sour cream or Greek yogurt and mix until well combined.
• Pour half of the cake batter into the prepared pan and with an offset spatula, spread to cover the bottom.
• Sprinkle half of the cinnamon streusel evenly over the cake batter.
• Cover with remaining batter and then sprinkle again with the remaining streusel.
• Bake for 30 - 35 minutes, until lightly browned and a toothpick inserted into the middle comes out with moist crumbs.Cool completely before slicing.