Pre-heat the oven to 350°.
Wash and prep your peppers. Slice them in half, right down the middle.** Then remove all the cores, seeds, and membranes from the peppers.
Dice the chicken into chunks or thin slices.
In a separate mixing bowl, mix the chicken with the seasonings, spinach, and 1 1/2 cups of the shredded cheddar.
Stuff the peppers with the chicken mixture.
Place the stuffed peppers on a baking sheet, and bake at 350° for 45 minutes to 1 hour, or until the chicken is cooked thru.
Add the rest of the shredded cheddar and Monterey Jack cheese to the top of each pepper, and bake for an additional 10 minutes, or until the cheese is melted.
Serve while warm and enjoy!