Cut each piece of stewing beef into 2 or 3 smaller pieces. Season the beef with salt and pepper. Place oil in a large skillet set over medium-high heat. Brown beef in batches and add them to your slow cooker. Add onion and green pepper to the skillet and cook 3 minutes. Spoon them, and the remaining ingredients, except green onion, into the slow cooker and mix to combine. (Mixture will be thick, but will thin as the chili simmers and cooks.) Cover and cook on the low setting 8 hours. Garnish servings of chili with green onion and serve.
Note: Diced means to cut into 1/4” to 1/2” cubes. A slow cooker with a six-litre capacity was used for this recipe.