Heat 1 tablespoon of avocado oil over medium heat in a large skillet or Dutch oven. Add the chopped yellow onion, red bell pepper, and green bell pepper. Sauté for about 5 minutes until the vegetables start to soften and the onions become translucent. Stir in the minced garlic and cook for another 30 seconds until fragrant.
Add the 2 pounds of ground beef to the skillet. Use a spoon or spatula to break it up as it cooks. Let it brown evenly, stirring occasionally, until no pink remains and the beef is cooked through.
Sprinkle 3 tablespoons of chili powder evenly over the beef and vegetable mixture. Stir well to coat everything. This allows the chili powder to toast slightly, deepening its flavor.
Pour in the 28-ounce can of crushed tomatoes, 2 cups of chicken broth, and the two drained and rinsed 15-ounce cans of black beans. Stir to combine all ingredients thoroughly.
Add 1 tablespoon of pure maple syrup, 1 teaspoon of sea salt, and ½ teaspoon of black pepper. Taste and adjust seasoning as needed.
Bring the chili to a gentle simmer. Reduce heat to low, cover, and cook for 25 to 30 minutes, stirring occasionally, to allow flavors to meld and the chili to thicken slightly. Serve hot with your favorite toppings or alongside cornbread.