To reheat, simply add to a skillet over medium low heat and warm for a few minutes on each side. Oven Method: Place the squash on a cookie sheet and oven bake at 350 degrees until warm (the amount of time will depend on the thickness of the squash). This recipe should only take 10-15 minutes. Microwave method: Place the squash on a microwave safe dish and cover with a paper towel to avoid a mess. Heat in 30 second increments until warmed.