Heat the olive oil in a large, deep skillet over medium heat. Add the ground turkey and cook, breaking it into small pieces, until almost cooked through.
1 tablespoon olive oil, 2 pounds ground turkey
Add the onion and red bell peppers. Cook for 2-3 minutes, until they begin to soften.
1 cup diced white onion, 2 finely diced red bell peppers
Add the garlic, tomato paste, tomato sauce, ketchup, Worcestershire sauce, Dijon mustard, brown sugar, smoked paprika, chili powder, salt and black pepper. Stir until well combined.
3 cloves minced garlic, 1 tablespoon tomato paste, 1 15-ounce can tomato sauce, 1/4 cup ketchup, 1 tablespoon Worcestershire sauce, 1 tablespoon Dijon mustard, 2 tablespoons brown sugar, 1 teaspoon smoked paprika, 1/2 teaspoon chili powder, 1 teaspoon salt, 1/2 teaspoon black pepper
Bring the mixture to a gentle simmer. Cook for 7-8 minutes, stirring occasionally, until the sauce has reduced slightly and thickened enough to coat the turkey. Make sure the ground turkey reaches an internal temperature of 165 °F (74 °C). Taste and add more salt and pepper if needed.
Serve the sloppy joe filling hot on the toasted hamburger buns with relish or sliced pickles, if desired. Refrigerate cooled filling in an airtight container for up to 4 days or freeze for up to 3 months. Reheat leftovers in the microwave or on the stovetop until heated through to 165 °F (74 °C).