Sauté the Vegetables: Heat a large skillet over medium heat. Add the diced onion and bell pepper. Cook for 5-7 minutes, stirring occasionally, until the vegetables are soft and translucent.
Cook the Meat: Add the ground pork, turkey, or chicken to the skillet. Break it up with a wooden spoon and cook for 5-7 minutes until the meat is browned and cooked through. Drain any excess fat if needed.
Add the Sauce: Stir in the ketchup, mustard, tomato sauce, brown sugar, Worcestershire sauce, chili powder, garlic powder, paprika, salt, and pepper. Mix everything together until well combined.
Simmer: Reduce the heat to low and let the mixture simmer for 5-10 minutes, stirring occasionally. The sauce will thicken slightly and the flavors will meld together beautifully.
Serve: Spoon the sloppy joe mixture onto toasted whole wheat buns or serve it over rice, baked potatoes, or alongside a fresh salad. Enjoy immediately!