To prepare a oatmeal snickerdoodles baked goods recipe, first you need to prepare the ingredients for the recipe. First, you'll need the following ingredients: Oatmeal: 1 cup (240 g) rolled oats 1 tablespoon (25 ml) baking powder 1 teaspoon (0.5 tsp) cinnamon 14 teaspoon nutmeg 2 tablespoons butter (or margarine) 1/2 teaspoon vanilla 2 teaspoons granulated sugar (optional) To make the icing, mix together the flour, baking soda, cinnamon, and salt. Then add the wet ingredients to the dry ingredients and mix until the mixture is just combined. Pour the batter into the prepared pan and bake for 20 minutes. Remove the pan from the oven and allow the cake to cool for 5 minutes before cutting it into squares.