Ingredients

• 1 ounce butter, softened (for greasing the pan)
• 1/4 cup dulce de leche (homemade or store-bought)

For the Chocolate Cake

• 3/4 cup sugar
• 5 ounces unsalted butter, softened
• 1 egg, room temperature
• 1 3/4 cup flour
• 3/4 teaspoon baking powder
• 3/4 teaspoon baking soda
• 1/2 cup cocoa powder, unsweetened
• 1 1/4 cup milk, room temperature

For the Flan

• 1 can (14 ounces) condensed milk
• 1 can (12 ounces) evaporated milk
• 4 eggs
• 1/2 tablespoon vanilla extract