Vegan Truffled Mushroom Grilled Cheese

I bought a little jar of white truffle oil to see what all the truffle buzz is about and it's pretty good stuff.  So far, I've only used it with mushroom dishes and this one is no exception.  I was debating between making a pizza and sandwich, and the sandwich won this time.  These can be made in a panini maker, in a toaster oven, or in a pan like traditional grilled cheese.  This would also make a delicious pizza, just use a pizza crust instead of bread.

Vegan Truffled Mushroom Grilled Cheese
Makes 6 sandwich rounds or 3 larger sandwiches

8 oz mushrooms sliced (I used button, but this would taste great with any variety)
3 cloves garlic, finely diced
1 small shallot, finely diced
1/2 T olive oil
2 t truffle oil
salt and pepper
6 T vegan mozzarella cheese (I used Daiya Mozzarella Style Shreds)
a big handful of spinach leaves
6 sandwich rounds (I used Rudi's Organic Whole Wheat Sandwich Flatz) or 6 large slices of bread

Make the mushrooms:

In a medium/large sized pan, over medium heat, cook the olive oil, mushrooms, and shallot for 5-6 minutes.  Add the garlic and cook 1-2 more minutes, until the mushrooms are cooked and the shallots are softened.  Remove from heat and season with salt, pepper, and truffle oil and give it a stir.

Assemble the sandwiches:
If using sandwich rounds, divide the mushroom mixture on 6 halves of the rounds or if using larger bread, on 3 pieces of the bread.  Top each of the 6 rounds with 1 T of vegan cheese, or top the 3 pieces of larger bread with 2 T each of vegan cheese.  Top each one with some spinach and put the other slice of bread on top to assemble the sandwiches.

In a pan sprayed with cooking spray, grill each side over medium/medium low heat for about 3 minutes, or until the bread is toasted and the cheese is melted and serve.