Preheat oven to 375 degrees F. Spray an 8x8 glass baking dish with cooking spray. Set aside.
Heat the oil in a large skillet over medium-high heat. Add the mushrooms and saute for 2-3 minutes, just until beginning to brown. Add the broccoli from the mac & cheese package and saute for 2 minutes more. Remove from the heat and add the pasta from the pouch and the cheese sauce. Stir to combine with the mushrooms and broccoli. Add to prepared baking dish and sprinkle with panko.
Bake for 15 minutes. Remove and serve immediately.