Caramelized Onion and Blue Cheese Quiche without milk

cooking spray 3/4 cup rolled oats 1/2 cup all-purpose flour 1/4 teaspoon salt 3 tablespoons unsalted butter , cold, cut into small pieces 3 tablespoons cold[...]

1 tablespoon olive oil 2 small onions , peeled halved and sliced 1 pie crust (pre made) 2 -3 ounces blue cheese (crumbled) or 2 -3 ounces gorgonzola[...]