Sky High Chicken and Vegetable Pie

Ingredients

• 1 large sweet onion (cut into wedges)
• 2 cups red peppers (sliced)
• 2 cups zucchini (sliced)
• 2 cups portabello mushrooms (sliced)
• 2 tbsp olive oil
• 1 clove garlic (minced)
• 1/2 tsp salt
• 1/2 tsp pepper
• 4 cups long-grain rice (cooked and cooled)
• 1 1/2 cups old cheddar (grated, divided)
• 1/2 cup onion (grated)
• 2 cups chicken (cooked and shredded)
• 1/4 cup fresh basil (chopped)