Check your recipe when cooking with oats, and use the specific oat recommended. In some recipes, either type of oat can be used.
Quick-cooking and old-fashioned rolled oats are interchangeable unless a recipe calls for a specific type. Instant oatmeal products, on the other hand, are not the same and should not be used for baking.
Keep brownies wrapped tightly with plastic wrap. For longer storage, wrap tightly with aluminum foil and freeze for up to 3 months.
Give brownies a new slant. Cut into diamond shapes by first cutting straight parallel lines 1 inch apart down the length of the pan, then cutting diagonal lines 1 inch apart across the straight cuts.