Mussels and Clam Triestina

Name: Mussels and Clam Triestina
Ingredients: 1/4 Cup extra-virgin olive oil, or enough to coat the bottom of a wide pot; 5 cloves garlic, peeled and crushed; 2 small onions, sliced into half-moons; Kosher salt; Pinch of red pepper flakes; 2 dozen Littleneck clams, washed and scrubbed; 1 Cup dry white wine, like sauvignon blanc or tocai fiulano; 2 Pounds mussels, washed, scrubbed, and debearded; 4 fresh bay leaves; 1/4-1/2 Cup dry, plain breadcrumbs; 3 Tablespoons chopped fresh Italian parsley