Cheesy chicken and corn wraps

Ingredients

• Chicken mixture
• 1 large barbecued chicken, meat shredded
• 1/2 tablespoon olive oil
• 1/2 large brown onion, chopped finely
• 175 grams button mushrooms, sliced thinly
• 1 clove garlic, crushed
• 20 grams butter
• 1 tablespoon plain flour
• 1 1/2 cup (375ml) hot milk
• 1 cup (120g) frozen peas and corn, thawed
• 3 green onions (green shallots), sliced thinly
• 8 flour tortillas
• 1 cup (120g) grated cheddar cheese