Ingredients
- 1.5 pounds top round steak, patted dry
- 1 tablespoon cornstarch
- 1 cup whole milk, divided
- 8 (3/4-ounce) American cheese slices, torn
- 6 (2/3-ounce) provolone cheese slices, torn
- 1 medium-size (10 ounces) sweet onion, chopped (about 1 3/4 cups)
- 3.5 tablespoons olive oil, divided
- 2.25 teaspoons kosher salt, divided
- 1 medium-size (8 ounces) red bell pepper, sliced (about 1 1/2 cups)
- 1 medium-size (8 ounces) green bell pepper, sliced (about 1 1/2 cups)
- 0.75 teaspoon black pepper, divided
- 4 crusty Italian hoagie rolls, split horizontally, keeping 1 long edge intact
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