Spray a 10x13 pan with cooking spray and preheat oven to 350 degrees F. (Use a larger pan if you have it. The more room the stuff has to spread out the better it cooks).
Rinse potatoes and cut into fourths. Leave skin on if you like. Place in pan.
Add bell pepper strips, onion wedges and mushrooms to pan.
Drizzle half the lemon juice mixture over veggies and toss to coat.
Place chicken on top and drizzle the remaining lemon mixture on top and brush or rub into meat. I use the back of a spoon or my fingers.
Bake until chicken is no longer pink in center basting after 15 minutes.
Note: To reduce fat and calories reduce the olive oil as much as you desire and use boneless skinless chicken. Bake for 1 hr if using the bone in chicken.
IMPORTANT:::: If the potatoes are still not DONE but the chicken IS - Remove the chicken and cover with foil- keep warm - Continue to cook the potatoes until done and return the chicken to the pan to serve - This WILL keep the chicken from getting dry if the potatoes need extra baking time! AND you can toss the foil for no mess clean up!
Use a stoneware pan if you have one. They conduct the heat better and the dish cooks faster. You may need to adjust the time if using a metal or glass pan.
I always add more onions, peppers and mushrooms and get my pan WAY too full! Do not be tempted to do the same- I have found it works better to double the sauce and veggies when I want and cook them separately from the meat. Everything gets done faster and more evenly.