Keep a bag in your freezer and toss in scraps while cooking. These scraps can be the tops, bottoms, skins, seeds of whatever your cooking.
Bell Pepper Tops
Onion Top, Bottom and Skin
Carrot Top, Bottom and Skin
Garlic Top, Bottom and Skin
Potato Top, Bottom and Skin
Plus any other scraps you have
Once the bag is full of scraps, you're ready to make your broth
Turn on stove and bring the water to a boil, reduce heat and let broth simmer on the stove for 1 hour.
After an hour strain out the veggie pieces. They should be soft and soggy.
Pour broth in an airtight container. Freeze or keep in the fridge for about a week. Enjoy!