Tuna pasta bake

Ingredients: 300g pasta (penne or fusilli work well) 1 can (approx. 185g) tuna in oil, drained and flaked 1 can (400g) chopped tomatoes 1 cup (240ml) cream or milk 1 medium onion, finely chopped 2 cloves garlic, minced 1 cup (100g) grated cheddar cheese 1/2 cup (50g) grated Parmesan cheese 1 cup (100g) frozen peas 2 tablespoons olive oil