Funfetti S'mores Cupcakes

Ingredients

• 1/4 tsp salt
• 2 eggs
• 2 1/2 tsp baking powder
• 1 1/4 cups milk
• 2 1/2 cups flour
• 1 1/2 cups sugar
• 2 tsp vanilla paste or extract
• 1 cup milk chocolate chips
•  
• 1/2 cup butter, softened
• 18 graham cracker sheets
• 3/4 cup (1 1/2 sticks) butter, softened
• 1 cup rainbow sprinkles
• approximately 3/4 cup marshmallow cream
• 1.5 ounces of heavy cream
• approximately 15 large marshmallows
• optional: more graham cracker crumbs for topping