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Preheat your oven to 350°F (175°C). Line a 9x5 inch loaf pan with parchment paper, leaving an overhang on the long sides to easily lift the loaf out later.

In a medium bowl, whisk together the all-purpose flour, granulated sugar, baking powder, 1/2 teaspoon ground cinnamon, and salt for the loaf. Set aside.

In a large mixing bowl, cream together the softened unsalted butter and granulated sugar until light and fluffy. This should take about 3-4 minutes with an electric mixer.

Beat in the eggs one at a time, ensuring each is fully incorporated before adding the next. Stir in the sour cream and vanilla extract until just combined.

Gradually add the dry ingredients to the wet ingredients, mixing on low speed until just combined. Do not overmix. Stir in the milk until a smooth batter forms.

In a small bowl, combine the light brown sugar and 1 tablespoon ground cinnamon for the swirl. Mix well.

In another small bowl, prepare the crumble topping. Whisk together the flour, light brown sugar, granulated sugar, and 1/2 teaspoon ground cinnamon. Cut in the cold butter with a pastry blender or your fingertips until the mixture resembles coarse crumbs.

Spoon half of the cake batter into the prepared loaf pan and spread it evenly.

Generously sprinkle the cinnamon swirl mixture over the batter. Gently press it down with the back of a spoon.

Carefully spoon the remaining cake batter over the cinnamon swirl layer, spreading it gently to cover.

Evenly sprinkle the crumble topping over the top of the loaf.

Bake for 50-60 minutes, or until a wooden skewer inserted into the center of the loaf comes out clean. If the top browns too quickly, you can loosely tent it with aluminum foil.

Remove the loaf from the oven and let it cool in the pan for 10-15 minutes before lifting it out using the parchment paper overhang. Transfer to a wire rack to cool completely before slicing and serving.


Preheat your oven to 350°F (175°C). Line a 9x5 inch loaf pan with parchment paper, leaving an overhang on the long sides to easily lift the loaf out later.

In a medium bowl, whisk together the all-purpose flour, granulated sugar, baking powder, 1/2 teaspoon ground cinnamon, and salt for the loaf. Set aside.

In a large mixing bowl, cream together the softened unsalted butter and granulated sugar until light and fluffy. This should take about 3-4 minutes with an electric mixer.

Beat in the eggs one at a time, ensuring each is fully incorporated before adding the next. Stir in the sour cream and vanilla extract until just combined.

Gradually add the dry ingredients to the wet ingredients, mixing on low speed until just combined. Do not overmix. Stir in the milk until a smooth batter forms.

In a small bowl, combine the light brown sugar and 1 tablespoon ground cinnamon for the swirl. Mix well.

In another small bowl, prepare the crumble topping. Whisk together the flour, light brown sugar, granulated sugar, and 1/2 teaspoon ground cinnamon. Cut in the cold butter with a pastry blender or your fingertips until the mixture resembles coarse crumbs.

Spoon half of the cake batter into the prepared loaf pan and spread it evenly.

Generously sprinkle the cinnamon swirl mixture over the batter. Gently press it down with the back of a spoon.

Carefully spoon the remaining cake batter over the cinnamon swirl layer, spreading it gently to cover.

Evenly sprinkle the crumble topping over the top of the loaf.

Bake for 50-60 minutes, or until a wooden skewer inserted into the center of the loaf comes out clean. If the top browns too quickly, you can loosely tent it with aluminum foil.

Remove the loaf from the oven and let it cool in the pan for 10-15 minutes before lifting it out using the parchment paper overhang. Transfer to a wire rack to cool completely before slicing and serving.
