Place mushrooms, peppers, tomatoes, potatoes and green beans on a large baking sheet that's been sprayed with nonstick spray. Depending on baking sheet size, you might need to use 2.
In a small bowl mix oregano, thyme, rosemary, garlic, salt + pepper and olive oil.
Pour olive oil mixture on the vegetables and toss to coat.
Bake vegetables for 25 minutes, flipping half way.
Remove from oven, and divide vegetables on sandwich rolls, adding a slice of cheese to each sandwich. Serve and enjoy!