1. Heat oven to 350°F. Butter two 6-ounce custard cups.
2. Put 1/2 teaspoon bake mix in each cup. Top with cheese, scallion, and onion flakes.
3. Whisk eggs, cream, and salt in a bowl. Gently pour over cheese mixture. Bake until a knife inserted in a quiche comes out clean, 20 to 25 minutes. Serve immediately, as the quiches fall quickly.