Creamy Tuna Broccoli Casserole with Melted Cheese - Quickie Treats

Ingredients

• 1 bunch fresh broccoli (2 to 3 heads, cut into florets)
• 1 large onion, chopped
• 2 garlic cloves, finely minced
• 150 g cherry tomatoes, halved
• Fresh basil leaves (for garnish, optional)
• 300 g canned tuna, drained
• 210 g crème fraiche
• 170 g mozzarella cheese, sliced
• 120 g sharp white cheddar cheese, shredded
• 2 tablespoons olive oil
• 2 teaspoons salt, divided
• 1/2 teaspoon black pepper