Butternut Squash, Mushroom, Onion, and Spinach Quesadillas January 22, 2019 By Patricia 18 Comments Butternut Squash, Mushroom, Onion, and Spinach Quesadillas make a great option when you’re looking for something hearty for lunch or dinner that won’t weigh you down. Add a salad and some chips and guac for a great meal!