Pretty quick and easy.

Take your cheese of choice (mozzerella works great for this) shred it and throw it in a large bowl. Add diced mushrooms, onion, garlic, anything else you want in the chicken and mix well.

Take chicken breast and make a pouch inside each one with a fillet knife. Stuff them as full of the cheese and veggies as you can without tearing the flesh. Set them all on a cookie sheet or in an over safe dish. Cover lightly with olive oil and herbs. bake in oven at 350-400 until almost done. Take the whole thing out and cover each breat with tomato paste and more cheese then place in oven again until cooked. Done

Sounds good

That dose sound good, very versatile also.
Not to get off the subjet but I like the custom engraving your company offers Chris.