Your freezer allows you to store and preserve cooked peppers and onions, whether you've grown a bumper crop or found a sale at the grocery store. The frozen surplus cuts down on food preparation time because you don't need to cut up fresh peppers and onions every time a recipe calls for them. Instead, you can cut up the vegetables at one time, cook them in a large batch and store them, which means you only have to clean up once. Use the frozen peppers and onions as a convenient way to add healthy vegetables to any meal.
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Spread the cooked peppers and onions in a single layer on a baking sheet, leaving a space between each piece so they don't clump together when freezing. Use multiple baking sheets if needed.
Place the baking sheets in the freezer for about 1 hour, or until completely frozen. Remove the baking sheets from the freezer.
Pour the peppers and onions into freezer storage bags, leaving 1/2 inch of head space to the top of the bag. Press out any remaining air and place the freezer storage bags into the freezer. For best results, use the peppers and onions within 4 to 6 months.