Butterscotch-Filled Cake with Marshmallow Frosting

Ingredients

For the cake

• 1 devil’s food cake, baked in a 9 × 13-inch pan and cooled

For the butterscotch filling

• 1 cup brown sugar
• 3 Tbsp flour
• 3/4 cup light cream
• 2 Tbsp butter
• 1 tsp vanilla extract
• 1/2 cup chopped nuts

For the marshmallow frosting

• 2 packages marshmallow creme, package size unspecified
• 4 pasteurized egg whites
• 4 Tbsp water
• 2 tsp vanilla extract
• Green food coloring, as needed

For decorating

• Baking chocolate, for making curls

Method