Pumpkin Pie Squares

I love these almost more than pumpkin pie! It's not healthy...but oh so good!

1 c. flour
1/2 c. quick oats
1/2 c. brown sugar, packed
1/2 c. butter
16 oz. pumpkin
2 cans evaporated milk
4 eggs
1 1/2 c. sugar
1 tsp salt
2 tsp cinnamon
1 tsp ginger
1/2 tsp ground cloves
1/2 c. chopped pecans or walnuts
1/2 c. brown sugar, packed
2 Tbl. butter

Combine flour, rolled oats, 1/2 c. brown sugar, and 1/2 c. butter in mixing bowl. Mix until crumbly, using electric mixer on low speed. Press into ungreased 9x13 pan. Bake at 350 degrees for 15 minutes. Combine pumpkin, evaporated milk, eggs, sugar, salt, and spices in a mixing bowl; beat well. pour into crust. Bake at 350 degrees for 30-40 minutes. Combine pecans, 1/2 c. brown sugar, and 2 Tbl butter. Sprinkle over pumpkin filling. Return to oven and bake for 30 minutes or until filling is set. Cool in pan and cut into 2 inch squares. Serve with whipped cream or cool whip.