In a large skillet set over medium heat, add the chopped onion, minced garlic, and ground beef. Cook, stirring often, until the beef is browned and the onions are soft. Cooks in 5 minutes or less.
1 yellow onion, 1 clove garlic, 1 pound ground beef
Drain beef if needed, transfer the beef to the slow cooker.
Add in the beans, diced tomatoes, water, chili powder, cumin, oregano, and salt. Stir.
2 15 ounce cans kidney beans, (dark or light) (do not drain), 2 14 ounce cans diced tomatoes (do not drain), 1/2 cup water, 1 tablespoon chili powder, 1 teaspoon ground cumin, 1 teaspoon dried oregano, 1 teaspoon kosher salt
Cook on high for 4 hours or low for 6 hours.
Serve warm with garnishes of your choice.