Crepe Quiche Lorraine

Name: Crepe Quiche Lorraine
Ingredients: 1 large egg; 6 tablespoons whole milk; 1/2 cup all-purpose flour; 1 1/2 tablespoons unsalted butter, melted, plus more for the pan; 2 tablespoons chopped fresh herbs; 1/8 teaspoon kosher salt; 1 teaspoon unsalted butter; 1/4 cup sliced onion; 2 strips bacon, cooked and crumbled; 4 large eggs; 6 ounces whole milk (3/4 cup); Kosher salt and freshly ground pepper; 1 ounce cheddar cheese, shredded (about 1/4 cup)