Slice bell pepper and onion thinly.

Slice roast beef into strips.

Add olive oil to a saute pan and toss in bell peppers, onion, and garlic powder.

Saute over medium-high heat for 6-8 minutes until caramelized.

Add roast beef strips to the bell pepper mixture and heat through, allowing it to brown.

Drizzle olive oil on sandwich rolls (or spray) and toast in a pan on high heat until crisp, or broil without olive oil.

Place provolone cheese on the toasted roll.

Top with the hot roast beef and onion/bell pepper filling.

Serve immediately, optionally with mayo.