Spicy Pumpkin Oat Squares

Preheat oven to 375 degrees F.
1 1/2 C old fashion oats
1 1/4 C all purpose flour
1/2 c chopped walnuts
1/2 tsp. baking soda
3/4 C brown sugar, firmly packed
3/4 c butter, softened
Mix above ingredients in a bowl,cut in butter until crumbly. Reserve 1 1/2 c of this mixture and press the rest into the bottom of a lightly buttered 9"X13" baking pan. bake for 10 minutes.
Filling
one 16 oz. can of pumpkin puree
1/3 C brown sugar, firmly packed
1T pumpkin pie spice
2/3 c milk
1 egg
While bottom crust bakes, combine all filling ingredients. Spread pumpkin mixture on top of baked crust and then sprinkle with reserved crumb mixture. bake about 25 minutes, or until lightly browned.