Pumpkin Pie Squares

3/4 cup flour
1 cup rolled oats
1/4 cup packed brown sugar
1/2 soft margerine
1-398 ml can pumpkin
1 can low Fat Condensed Milk
2 eggs
1 tsp each ginger and cinnamon

Combine flour, oats and brown sugar, stir in margarine. Press evenly into 9" square baking pan. Bake at 350 for 15 minutes. Combine remaining ingredients, pour over base in pan; Return to oven and bake 25-30 minutes. Serve warm or chilled with whipped cream.