Plantain Frittata

Name: Plantain Frittata
Ingredients: 3 large eggs; 2 tablespoons plus 1 teaspoon olive oil , divided; 1/2 red, green, yellow bell pepper , finely diced; 3 scallions , thinly sliced; 2 Roma tomatoes , small dice; 1/2 cup baby spinach; 1 teaspoon sea salt , divided; 1 teaspoon black pepper , divided; 2 small ripe yellow plantains , peeled and sliced into 1cm rounds; 1 tablespoon fresh rosemary , minced; Dried red chile flakes , to serve