Preheat your oven to 375°F. Season the chicken breasts with garlic powder, onion powder, paprika, salt, and pepper on both sides.
In a large oven-safe skillet, heat the olive oil over medium-high heat. Add the seasoned chicken breasts and sear for about 4-5 minutes on each side until golden brown. Remove the chicken from the skillet and set aside.
In the same skillet, add the sliced mushrooms, green bell pepper, and onion. Sauté for about 5-7 minutes until the vegetables are tender.
Reduce the heat to low and stir in the heavy cream and Worcestershire sauce. Allow the mixture to simmer for 2-3 minutes.
Return the chicken to the skillet, spooning some of the vegetable mixture over the top. Sprinkle the shredded Monterey Jack cheese evenly over the chicken.
Transfer the skillet to the preheated oven and bake for 20-25 minutes, or until the chicken is cooked through and the cheese is bubbly and golden.
Remove from the oven and let it rest for 5 minutes. Garnish with chopped parsley if desired before serving.