Step 1: Prepare the Oven
Preheat your oven to 350°F (175°C).
Grease and line a 9×5-inch loaf pan with parchment paper.
Step 2: Mix the Dry Ingredients
In a bowl, whisk together:
- Flour
- Baking powder
- Salt
Set aside.
Step 3: Cream the Butter and Sugar
In a large mixing bowl, beat the butter and sugar for 3–4 minutes until light and fluffy.
Step 4: Add the Eggs
Beat in the eggs one at a time.
Add the vanilla extract and mix well.
Step 5: Add the Wet and Dry Ingredients
Gradually add the flour mixture, alternating with the milk.
Fold in the sour cream until the batter is smooth.
Do not overmix.
Step 6: Prepare the Cinnamon Swirl
Mix the brown sugar and cinnamon in a small bowl.
Step 7: Assemble the Cake
Pour half of the batter into the prepared loaf pan.
Sprinkle half of the cinnamon mixture over the batter.
Add the remaining batter and finish with the rest of the cinnamon sugar.
Use a butter knife to gently swirl the cinnamon through the batter.
Step 8: Bake
Bake for 50–60 minutes, or until a toothpick inserted into the center comes out clean.
If the top browns too quickly, loosely cover it with foil during the last 15 minutes.
Step 9: Cool
Let the loaf cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely.
