Preheat the grill to 300 degrees and set for indirect heat.
Place the ground turkey into a cast iron skillet and set it on the grill grates.
Break up the meat to create the meat crumbles which will allow the protein to cook evenly. Season with your choice of taco seasoning. Total cook time will be around 5 minutes or until the turkey meat browns up. Remove from the cast iron and set aside covering it in foil.
Dice up the sweet potatoes and onion into small cubes keeping the veggies separate from one another.
Throw the potatoes into the same cast iron that was used to cook the ground turkey. Season the potatoes with taco seasoning and let if cook until they are medium soft.
Next, add in the chopped onions and continue grilling until all the veggies are fork soft. Total cook time for veggies will be around 20 minutes.
In a mixing bowl, add the cooked ground turkey, grilled veggies, salsa and shredded colby jack cheese. Fold in the ingredients together.
Cut off the top of each bell pepper and remove the inside making the veggie hollow. Stuff each bell pepper compactly to the top and sprinkle more shredded colby jack cheese over the top.
Place the stuffed bell peppers upright in the cast iron and place them back on the grill for another 20 minutes allowing the cheese to melt and soften the peppers.