In a bowl, mix together, green bell peppers, onions, mushrooms, 2 tablespoons of oil, salt and pepper.
Combine cube steak seasoning and sprinkle evenly over both sides of the steaks. In a large saute pan, over medium high heat, add oil. Once hot cook steaks for 4 minutes on each side and remove from pan.
Add veggie mixture to pan and saute for 4-5 minutes. Reduce heat to medium and cover with lid and continue cooking until bread is done toasting.
Split rolls and line out, cut side up, on a parchment paper covered baking sheet. Use one tablespoon of oil to lightly brush over each bread half. Place in oven and lightly toast for 8 minute.
In small bowl combine mayo ingredients.
Remove rolls from oven and spread each with a layer of mayo mixture.
Place bottom bun back on to parchment paper covered baking sheet (careful, it's still hot). Add a steak and a portion of cooked veggie mixture to each bottom bun. Layer two slices of cheese atop each sandwich. Cover with top bun and return to oven for 8 minutes more.
Remove from oven and allow to rest for at least 5 minutes before cut in half on the diagonal and serving.
Keyword bell peppers, cube steak, gouda, green peppers, horseradish, mayo, mushrooms, onions, sandwich, smoked gouda