• 2 1/4 cups all-purpose flour – Provides structure to the cake.
• 1 1/2 teaspoons baking powder – Helps the cake rise beautifully.
• 1/2 teaspoon baking soda – Balances acidity from the sour cream.
• 1/2 teaspoon salt – Enhances flavor.
• 1 cup unsalted butter, softened – For a rich, creamy texture.
• 1 3/4 cups granulated sugar – Adds sweetness.
• 4 large eggs – Provides structure and moisture.
• 2 teaspoons vanilla extract – Enhances the cake’s flavor.
• 1 cup sour cream – Makes the cake incredibly moist.
• 1/2 cup milk – Helps create a smooth batter.
• 1 cup fresh or frozen blueberries – Adds bursts of flavor and color.
• 1/4 cup blueberry jam (optional) – Intensifies the blueberry swirl.
• 1 cup powdered sugar – The base of the glaze.
• 2-3 tablespoons blueberry puree – Adds natural color and fruity sweetness.
• 1/2 teaspoon vanilla extract – Complements the blueberry flavor.