Caramel Popcorn Cupcakes

Name: Caramel Popcorn Cupcakes
Prep time: 20 min
Cook time: 20 min
Total time: 40 min
Cuisine: American
Ingredients: 1 1/4 cups cake flour (substitute all purpose flour); 1/4 cup cornmeal (substitute all purpose flour); 1 1/2 teaspoons baking powder; 1/4 teaspoon kosher salt; 1/2 cup unsalted brown butter (melted); 1/2 cup granulated sugar; 1/2 cup light brown sugar; 2 large eggs (room temperature ); 1 teaspoon vanilla extract; 1/2 cup sour cream (substitute plain yogurt or whole milk); 1 cup unsalted brown butter (room temperature); 3 cups powdered sugar; 1/2 cup salted caramel; 2-3 tablespoons heavy cream (if needed); caramel popcorn; salted caramel; flaky sea salt