These easy vegetarian sandwiches are something even a meat lover will have no problem eating! Super flavorful, savory, and perfect for a chilly game day.
1) Slice mushrooms and onions. Add butter to griddle over medium heat. Once melted add onions and cook for 2-3 minutes until they start to brown slightly. Then add mushrooms and season with salt and pepper. Let sit so mushrooms wilt and start to brown. Cook the mushrooms and onions for 6-7 minutes total until they are soft and browned in spots.
2) Add garlic, thyme, and red pepper flakes to the mushroom mixture and stir to combine. Turn heat down to low on the griddle and divide the mushroom mixture into two even piles.
3) Slice rolls in half and lightly butter them. Place rolls in the griddle, cut-side down. Add cheese to mushroom piles and let melt for a minute or two.
4) Scoop the mushroom and onion mixture into the griddled roll and eat immediately or wrap in foil to keep it warm for a few minutes!