Preheat oven to 375 degrees.
Bring 1/2 cup of peanut butter, water, 1 stick of margarine, and cooking oil to a boil, then set aside.
Mix 1/2 cup of milk, 2 eggs, 1 teaspoon vanilla extract.
Combine flour, sugar, and baking soda.
Combine wet and dry ingredients together, mix well.
Pour mixture into a lightly sprayed sheet pan approximately 12x17-inch.
Bake at 375 degrees for 25 minutes.