Pumpkin pie spice, optional for extra spiced flavor (I did 1 teaspoon for spice cake mix and 1 tablespoon for yellow cake mix)
Turbinado sugar, optional for topping
Stir pumpkin pie spice and salt into batter before spooning into muffin tin, then top each filled muffin cup with turbinado sugar before baking.
Optional Mix-Ins
2/3 cup total mix-ins: chocolate chips, white chocolate chips, pumpkin spice chips, chopped pecans, etc.
Stir mix-ins into batter before spooning into muffin tin and baking.
Optional Crumb Topping
3/4 cup all-purpose flour
1/4 cup granulated sugar
1/4 cup packed dark brown sugar
2 tablespoons cornstarch
1 teaspoon ground cinnamon
1/4 teaspoon salt
6 tablespoons unsalted butter, melted
Stir together flour, sugar, brown sugar, cornstarch, cinnamon, and salt, then use a fork to stir in melted butter to create clumps. Place in fridge until ready to use, then spoon evenly over the filled muffin cups before baking.
Optional Glaze
2 tablespoons unsalted butter
1 tablespoon maple syrup
1 teaspoon vanilla
1/4 teaspoon cinnamon
1/4 teaspoon salt
1 1/4 cups powdered sugar
1-2 tablespoons milk
Melt butter in a microwave safe bowl, then whisk in maple syrup, vanilla, cinnamon, salt, and powdered sugar. Whisk in milk to create a glaze, then spoon over baked and slightly cooled muffins.