Pumpkin chocolate chip muffins

This is one of my mother-in-laws recipes and a favorite of my wife's as a kid during the colder months.  My mother-in-law made mini muffins, but I only have a regular size tin, so I make regular size ones.  I think this might be a bit of an improvement, as the muffins get a bit more of a crunchy outside due to being in the oven longer.  It is a basic recipe, but good.  I might try substituting mashed sweet potatoes or another mashed squash for the pumpkin.  Pumpkin is, after all, a squash.

Pumpkin Chocolate Chip Muffins

1 2/3 cups all purpose flour
3/4 cup sugar
1/2 cup chocolate chips
1 tsp cinnamon
1 tsp baking soda
1/4 tsp baking powder
2 large eggs
3/4 cup canned pumpkin
1/2 cup melted butter
1/4 cup milk
1/2 tsp vanilla

1) Add the wet ingredients to the dry and stir until just mixed.
2) Add to greased muffin tin or to cupcake cups.
3) Bake at 350 for ~30 minutes, until a knife inserted comes out clean.