Pumpkin Chocolate Chip Muffins

Ingredients:   1 cup pumpkin puree 1 1/2 cups flour 1/2 cup sugar 2 tablespoons brown sugar 1 teaspoon baking soda 1/2 teaspoon salt 1 teaspoon cinnamon 1/2 teaspoon nutmeg 1/2 cup melted butter 2 eggs 1/4 cup half and half 2 teaspoons vanilla 1 cup...