To prepare a oatmeal cookies, the best baked goods recipe, you'll first need to gather your ingredients. Preheat the oven to 375 degrees F (190 degrees C). Grease and flour two 8-inch-square baking pans with butter or margarine. Add the dry ingredients to the wet ingredients and stir to combine. Scoop the mixture into the prepared pan and bake for 12 to 15 minutes or until the edges are lightly browned. Let the cookies cool on the pan for 5 minutes before transferring to wire racks to cool completely.