Heat a glug of olive oil in a medium pan (I love using my cast iron skillet for this as I can pop it in the oven as well). Add onion and cook until soft and fragrant. Add garlic and cook for an additional minute.
In a large bowl, combine onions, garlic, roasted red pepper, feta cheese, oregano, rice (if using) and beaten eggs. Season with a touch of salt and pepper.
Pour egg mixture into a greased, oven safe pan (once again, cast iron is great for this) and bake for 30 minutes, until a toothpick inserted in the middle comes out clean. Let cool for at least 5 minutes before serving.
Recipe by Port and Fin at https://portandfin.com/roasted-red-pepper-feta-frittata/