Two tortillas (corn or flour), melty cheese (queso Chihuahua, monterrey jack, mozzerella, gruyere, you get the picture) and a medium hot pan or...

Commonly known as quesadillas. I useta use the oven (350° for 5 or 7 minutes depending on did you defrost the spinach), but me'n the ASp got a quesadilla maker for Christmas from her mom. It's totally unnecessary but lots o fun. And you get quesadillas in little sealed around the edges sections. Makes them a lot easier to cut up witout spilling no filling all over the place. Shrooms are real good in these thangs but I ain' telling y'all nothin bout my sekert ingrediment.