Frittata with Ricotta Cheese and Roasted Peppers Frittata con Ricotta e Peperoni

Name: Frittata with Ricotta Cheese and Roasted Peppers (Frittata con Ricotta e Peperoni)
Ingredients: 1⁄2 cup grated pecorino; 2 tbsp. roughly chopped flat-leaf parsley leaves; 1 1⁄2 tsp. kosher salt; 1 tsp. chopped fresh oregano; 8 eggs, beaten; Freshly ground black pepper, to taste; 3 tbsp. extra-virgin olive oil; 1 large yellow onion, halved and thinly sliced; 1 small waxy potato, peeled and sliced into 1/8″ rounds; 1 red bell pepper, roasted, peeled, and cut into 1/4″ strips; 3⁄4 cup homemade or store-bought ricotta