Caramelized Onion and Blue Cheese Quiche without cream

1 -2 onion , peeled and sliced 1 (10 ounce) box frozen spinach , thawed 1 cup gruyere , grated 4 eggs 1 1/2 cups milk (or cream) nutmeg salt and pepper canola[...]

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[...]