This cheesy mushroom and pesto tray bake is a delicious and easy-to-make dish that is perfect for a quick weeknight dinner. The combination of earthy mushrooms, creamy cheese, and flavorful pesto creates a mouthwatering flavor profile. The dish is baked in the oven, allowing the flavors to meld together and the cheese to become gooey and golden. Serve this tray bake as a main course with a side salad or crusty bread for a satisfying meal.