Preheat oven to 350 degrees F. Grease mini-muffin pan with cooking spray or insert mini muffin cups.
Sift together the flour, brown sugar, white sugar, cinnamon, ginger, nutmeg, baking soda, baking powder, and salt into a large bowl.
Whisk together the egg, butter, and pumpkin in a separate bowl. (Note: I melted the butter in the microwave, so it was still hot. So I added the pumpkin to it to help it cool down quick before adding the egg.)
Mix the flour mixture with the egg mixture. Stir in the butterscotch chips; pour into each cup of the muffin pan to about ¾ full. (I used a Tbsp measuring spoon)
Bake in preheated oven until a toothpick inserted into the center of a muffin comes out clean, 10 to 12 minutes.
Recipe by Simple, Sweet & Savory at https://www.simplesweetsavory.com/pumpkin-butterscotch-mini-muffins/