From the moment I saw this idea floating around on Pinterest I beat up on myself for making grilled cheese for the past 28 years without avocado. The luxuriant texture of an avocado is born to pair with melty cheese. But depth of cheese was needed here... silky provolone and feta with bite. But one more component made the cheese say "you complete me" -- a toothsome bite of fresh spinach. Ugh... I die.
Spinach Avocado Grilled Cheese
8 slices good quality sandwich bread
1 avocado, sliced
4 slices provolone cheese
1 cup feta cheese, crumbled
2 cups baby spinach
Spread a thin layer of butter on one side of each slice of bread. With butter side down, layer provolone, avocado, spinach and feta onto bread. Top with another slice; butter sides out.
Grill sandwich over low heat until both sides are slightly browned and cheese is melted.