Divide the batter evenly among the cupcake liners, filling each about two-thirds full.
Bake for 18-20 minutes, or until a toothpick inserted into the center of a cupcake comes out clean.
Allow the cupcakes to cool in the pan for 5 minutes before transferring to a wire rack to cool completely.
Prepare Frosting:
In a large bowl, beat the softened butter until creamy.
Gradually add the powdered sugar, beating until smooth.
Add the blackberry puree and vanilla extract, continuing to beat until the frosting is light and fluffy.
Frost and Serve:
Once the cupcakes are completely cool, frost them with the blackberry frosting.
Enjoy your delightful Lemon Poppy Seed Cupcakes with Blackberry Frosting! 
Prep Time: 20 minutes | Cooking Time: 20 minutes | Total Time: 40 minutes
Servings: 12 cupcakes
Calories: 300 kcal per serving
Lemon Poppy Seed Cupcakes with Blackberry Frosting
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