Pesto Chicken Philly Melt - Chicken Farmers

Ingredients

• 1 boneless, skinless chicken breast
• 1 1/2 tbsp (25 mL) balsamic vinegar
• 1/4 cup (60 mL) olive oil
• 2 cloves garlic, minced
• Montreal steak spice
• 1/4 green pepper, sliced
• 1/4 red pepper, sliced
• 1/4 onion, sliced
• pinch of oregano
• 2 tbsp (30 mL) pesto
• 1 tbsp (15 mL) mayonnaise
• 1 tbsp (15 mL) jalapeño peppers, chopped (optional)
• 1 Ciabatta bun
• 3 slices 2 year old Bothwell cheddar
• lettuce, shredded
• 3 tomato slices