Preheat the oven to 375℉.
Cut the turkey breast open hamburger bun style so that it can lay flat and even.
Prepare the stuffing for the turkey breast. Add the cream cheese, broccoli, bell pepper, garlic, green onions, cheddar cheese, red pepper flakes, and sour cream to a bowl and mix until combined.
Season the turkey breast with the turkey seasoning. Use your hands to massage the turkey seasoning into the turkey breast, being sure the whole breast is covered with seasoning.
Place the stuffing mixture on one side of the sliced turkey breast.Then, fold the other side over and use toothpicks to secure the end pieces together so it is mostly closed.
Add the olive oil to a cast iron skillet and heat over medium/high heat. When the oil has become fragrant, add the turkey to the skillet and cook on all sides for 2-3 minutes.
Remove from heat and add the chicken broth. Cover with aluminum foil and bake in the oven for 20 minutes. Remove foil and bake for another 10 minutes.
Remove from the cast iron skillet and place on a cutting board. Allow to rest for 10 minutes before slicing.