Dulce de Leche Cake | Saveur

Ingredients

• 2 tsp. butter
• 1 tbsp. plus 2 cups flour
• 2 tsp. baking powder
• 1 ¹⁄₂ tsp. fine salt
• 6 eggs, at room temperature, separated
• 1 ¹⁄₄ cups sugar
• ¹⁄₂ cup whole milk
• 1 ¹⁄₂ tbsp. dark rum
• 1 tbsp. vanilla extract
• 1 cup heavy cream
• 1 (14-oz.) can sweetened condensed milk
• 1 (12-oz.) can evaporated milk
• 1 (16-oz.) jar dulce de leche (milk caramel)