I came up with a recipie for quesadillas that used mushrooms. I was almost out of the chicken one night and threw in some mushrooms to replace the meat and they're even better like this!
Microwave some of those frozen pre-grilled tyson chicken strips until thawed. While they're microwaving, chop your mushrooms and sautee them in some olive oil until tender. Add the thawed chicken (since they're pre-cooked, all you have to do is heat them up a bit more on the stove). Add some Montreal steak seasoning to the chicken and mushrooms.
Butter one side of a tortilla and place it butter side down in your skillet, griddle (the griddle makes for easier flipping!), etc. Spoon the chicken and mushroom mixture onto tortilla. Then place two slices of pepper jack cheese on top of the chicken and add fresh, chopped jalapenos if you like the heat. Place another buttered tortilla on top. Cook until the bottom tortilla is golden then flip and do the same with the other. The higher the heat you cook them on the crispier they'll get, but you have to watch them more closely so they don't burn. My husband and almost three year old LOVE these quesadillas. Good luck!