Lemon Poppy Seed Cupcakes with Blackberry Frosting
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Cupcake Ingredients 1/2 cup butter, room temperature 1 cup sugar 2 tablespoons lemon zest 2 eggs 2 teaspoons vanilla 1/2 teaspoon baking soda 1/4 teaspoon salt 2/3 cup sour cream 1 1/2 cups flour 3 tablespoons lemon juice 2 tablespoons poppy seeds Frosting Ingredients 1 1/2 cups blackberries 1 cup butter, room temperature 4 cups powdered sugar 1/4 teaspoon salt 1 tablespoon milk or cream, if needed.