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In a large, deep skillet, heat the olive oil over medium-high, and then add the garlic and onions. Cook about 2 minutes.
Next add the tomatoes, tomato paste, sugar, basil, and oregano. Cook for about 5 minutes until the tomatoes and onions are softened and most of the liquid has evaporated.
Add the mushrooms. Cook about 2 minutes, just until the mushrooms begin to darken and shrink. Stir in the salt, pepper, and crushed red pepper. Remove from the heat and set aside.
Preheat your broiler to high and broil the sandwich buns cut-side up on a baking sheet. Remove after 1 to 2 minutes when they are slightly browned. Remove the top portion of the buns from the baking sheet and set aside.
Top each bottom bun with about ¾ cup of the mushroom mixture and then top with 2 tablespoons of cheese. Place the baking sheet under the broiler for about 2 to 3 minutes, or until the cheese is browned and bubbly.
Remove from the oven, transfer the bottom bun to a plate. Place the top portion of the bun on the sandwich and serve warm.