Ultra-Moist Raspberry Blueberry Semi-Naked Cake
✨Cake Ingredients: * 2 ¼ cups cake flour, plus a pinch for berries * 1 ½ cups granulated sugar * 1 tsp baking powder (heaping) * 1 tsp kosher salt * ¾ cup unsalted butter, room temperature * 1 cup whole milk, room temperature * ¼ cup sour cream, room temperature * 1 tbsp vanilla extract