Heat the olive oil in a large skillet over medium-high heat.
Add the ground beef, breaking it apart with a wooden spoon, and cook until browned and no longer pink.
Stir in the diced yellow onion, green bell pepper, and minced garlic, sautéing for 3-4 minutes until the vegetables begin to soften.
Transfer the beef and vegetable mixture into the slow cooker basin.
Add the rinsed red kidney beans, tomato puree, chili powder, ground cumin, sea salt, black pepper, and water.
Stir all ingredients together until well combined.
Cover and cook on low for 6 to 8 hours or on high for 3 to 4 hours to allow the flavors to meld beautifully.
Serve warm and enjoy this hearty, protein-packed bowl.