Brown ground beef in a large skillet over medium-high heat until browned, breaking it up as it cooks.

Add diced onion, green bell pepper, chili powder, sugar, cumin, salt, and minced garlic to the skillet with the beef.

Sauté the mixture until the onion is tender.

Transfer the meat mixture into a slow cooker.

Stir in the undrained kidney beans, undrained diced tomatoes, and finely diced jalapeno.

Cover the slow cooker and cook on low for 4 hours.