For a quick and tasty vegetarian option along with the ham and brie panini, this thyme and mushroom panini was tested. It proved to be a good competitor, though not as tasty as its goat cheesy version with homemade garlic flatbread.
8 oz mushrooms
4 slices of deli sourdough bread
4 tsp Dijon mustard
2 tsp minced fresh thyme
4 oz cheddar cheese
4 slices of red onion
Spread the mustard onto the bread slices. Brown the mushrooms and toss with the minced thyme. Distribute onto the two sandwiches. Sprinkle with onions and add the cheese slices. Cover with the other slice of bread and toast in a panini oven.