In a medium skillet over medium heat, cook the ground beef and onions until the beef is no longer pink. Drain.

Stir in the garlic powder, mustard, ketchup, brown sugar, and water, mixing until combined. Add salt and pepper, to taste.

Reduce the heat and simmer for 30 minutes.

HOW TO SERVE LEFTOVERS (Bonus)

If you have any sloppy joe leftover, you can store it in the refrigerator in an airtight container for up to 3 days. Here are a few options you can use the sloppy joes for (besides in a hamburger bun):

Chili Dog
Bake it with rice and cheese in a bell pepper
Pile it on Chili Cheese Fries
Add it to your baked potato
Scoop it up with some Fritos or add it to a plate of nachos