High-Protein Tuna Penne Bake

Ingredients

• Pasta, uncooked, 250 g, penne
• Tomato-based pasta sauce, 1 500g jar(s), oregano flavoured if available
• Mushrooms, 200 g, sliced
• Black olives, drained, 0.3 cup(s)
• Tuna, canned in springwater, 1 x 425g can(s) (drained)
• Olive oil, ½ teaspoon(s)
• Red capsicum, 1 capsicum(s), diced
• Onion, any type, ½ medium
• Shredded cheese, reduced fat, 0.3 cup(s)