This frittata is a go-to for breakfast, lunch or dinner. Cut the frittata into larger squares and tuck into whole grain pita halves or roll into whole grain tortilla.
In an ovenproof 25 cm (10 inch) non-stick skillet, cook spinach over medium heat, stirring for about 2 minutes or until wilted. Add pepper, garlic and hot pepper flakes; stir to combine. Add oil and cook for 3 minutes or until softened.
In a bowl, whisk together eggs, water (or skim milk), and cheese. Pour into skillet and stir to combine with spinach. Lift edges with a rubber spatula and let eggs run to the bottom. Let cook, until edge starts to set.
Place skillet about 10 cm (4 inches) under broiler for about 3 minutes or until top is set and light golden. Use a digital food thermometer to check that the eggs have reached an internal temperature of 74°C (165°F).