Oatmeal S'More Cookies

This recipe came from a Taste of Home magazine from a few years ago. This is a great oatmeal cookie alternative for those weirdos who don't enjoy raisins.

1/2 c butter, softened
1/2 c shortening
1 c pack brown sugar
1/2 c granulated sugar
2 eggs
1 1/2 tsp vanilla
2 1/4 c flour
1 tsp baking soda
1/2 tsp salt
1 c oats
1 c semisweet chocolate chips
1 c mini marshmallows*

Preheat oven to 350 degrees. Cream butter, shortening and sugars in a large mixing bowl. Ad eggs one at a time, mixing well after each egg. Beat in vanilla. Gradually add flour, baking soda and salt. Stir in oats, chocolate chips and marshmallows. Drop by heaping teaspoon onto a greased cookie sheet. Bake at 350 for 11-13 minutes. Let cool 1-2minutes before removing from pans to wire racks to cool. (If cookies come out flat, chill dough for 30 minutes before baking.)

*I don't know if it's my altitude, but I've found that the marshmallows bake better if they've been allowed to dry out a few hours before adding them to the cookie dough.