Cheese and Mushroom bread

Remember yesterdays bread?  This goes amazing on it.

Side note, I hate mayonnaise (I can handle homemade, but the jarred stuff is disgusting).  DO NOT SKIP IT, this is so much better with it, gives it an amazing melty feeling even when the bread is completely cooled.

1 T unsalted butter
1 t olive oil
3 C sliced crimini mushrooms
1 T fresh thyme leaves, plus more for garnish
2 C shredded mozzarella
1 C shredded swiss cheese
1/4 C mayonnaise
1/2 t garlic
1/4 t black pepper
1/2 loaf bread (1 whole loaf cut lengthwise)

Preheat oven to 425 degrees.

Heat butter and olive oil in a skillet over medium heat until butter melts. Add in mushrooms and cook, stirring occasionally until the mushrooms start to brown, about 10 minutes. Remove from heat and allow to cool.
Combine cooled mushrooms, thyme, mozzarella, swiss, mayonnaise, garlic and black pepper in a bowl. Mix well.
Spoon and spread mixture on the bread. Cook in preheated oven for 15 - 20 minutes or until bread starts to brown and cheese is bubbly. Remove from oven, allow to cool several minutes, garnish with fresh thyme leaves, slice and serve.