Spanish Omelette

Name: Spanish Omelette
Ingredients: 2 tablespoon(s) olive oil; 1 tablespoon(s) unsalted butter; 3/4 pound(s) small red potatoes, very thinly sliced; 1 cup(s) diced onion; 1 large orange bell pepper, seeded, cut into 1 1/2-inch strips; 1 teaspoon(s) minced garlic; 1 teaspoon(s) kosher salt; 1/2 teaspoon(s) ground pepper; 10 large eggs; 2 tablespoon(s) chopped flat-leaf parsley