In a large pan over medium-high heat warm oil. Add in peppers and onions, cook for 2-3 minutes, stirring occasionally.
1 tablespoon olive oil, ½ cup red and green peppers, ¼ cup onions
Add in the roast beef, cheeses, and milk. Lower heat to medium-low, stirring occasionally until cheese melts and ingredients are well combined.
13 ounces deli roast beef, 8 ounces cream cheese, 4 ounces provolone cheese, 4 ounces mozzarella cheese, ¼ cup milk
Turn off heat, add zest, lemon juice, and salt and pepper. Fold together and serve hot with bagel chips or slices of baguette bread.
Zest of ½ a lemon, ¼ teaspoon lemon juice, Salt and pepper , Parsley