Place a large skillet over medium-high heat and brown the ground beef until no pink remains, breaking it into small crumbles with a spatula.
Drain the rendered fat from the skillet and transfer the cooked beef into the slow cooker basin.
Add the diced yellow onion, green bell pepper, and minced garlic directly into the slow cooker over the beef.
Pour in the crushed tomatoes, tomato paste, and water, then add the rinsed kidney beans to the mixture.
Sprinkle the chili powder, ground cumin, smoked paprika, sea salt, and black pepper over the ingredients.
Stir all ingredients thoroughly to ensure the spices and tomato paste are evenly distributed throughout the basin.
Cover the slow cooker with its lid and cook on the low setting for 6 to 8 hours, or on high for 3 to 4 hours.
Give the chili a final stir to incorporate the flavors before portioning into a bowl to serve.