Healthy tomato and spinach frittata - Starts at 60

Ingredients

• Butter, for greasing
• 2 tablespoons olive oil
• 1 pint cherry tomatoes
• 1 bunch shallots, thinly sliced
• 3 1/2 packed cups baby spinach leaves
• 1/2 cup milk
• 1/2 cup sour cream
• 12 large eggs
• 3/4 teaspoon salt, divided
• 1/8 teaspoon freshly ground black pepper
• 1 cup crumbled feta cheese
• 3 tablespoons chopped fresh parsley