open-faced saucy philly cheesesteak sandwich

Ingredients For open-faced saucy philly cheesesteak sandwich

• 1 tsp

  olive oil
• 1 1/2 c

  red bell pepper strips
• 1 1/2 c

  yellow bell pepper strips
• 1 1/2 c

  vertically sliced onion
• 1 Tbsp

  balsamic vinegar
• 1 tsp

  sugar
• 1 tsp

  dried oregano
• 1/4 tsp

  garlic powder
• 4

  (2-ounce) slices bread, toasted
• 3/4 lb

  thinly sliced deli roast beef
• 2 Tbsp

  chopped fresh parsley
• 8 oz

  shredded cheddar cheese