Sounds gross, I know. But these are actually very tasty, and a great way to use up squash.
2 cups cooked mashed yellow squash
1 cup sugar
2 sticks butter, melted
3 cups flour
1 teaspoon salt
1 ½ teaspoons baking powder
Mix, spoon into muffin tin, bake at 375 for 20 minutes.
I've made this with a little less than two full sticks of butter (not exactly healthy, I know, and the butter is the most expensive part of the dish) and they turned out fine.