Pumpkin Cupcakes with Pumpkin Spice Butter Cream Frosting Disclosure: This Pumpkin Cupcakes post has been sponsored by Dixie Crystals in conjunction with a social media campaign through Sunday Supper LLC. All opinions are my own. Celebrate Halloween and the flavors of Fall with these moist and delicious Pumpkin Cupcakes with Pumpkin Spice Butter Cream Frosting.