Spinach Frittata Recipe | Trisha Yearwood | Food Network

Ingredients

• 4 large eggs
• 1/2 cup whole milk
• 1/2 teaspoon salt
• 1/4 teaspoon freshly ground black pepper
• 1 cup shredded Swiss cheese
• 1 cup lengthwise-halved grape tomatoes
• 2 tablespoons salted butter
• 1 small onion, finely chopped
• 4 cups fresh baby spinach