To bake a roux, preheat oven to 400 degrees. Put some (about 1/3 c.) of flour pie pan or cake pan which has been sprayed with PAM. Bake at 400 degrees stirring frequently until roux is caramel colored and just begins to have a burnt smell. Don't bake it any longer! Store roux in refrigerator . When recipe calls for roux add an equal measure of water to whatever amount of flour is called for in the recipe.