Special equipment: A 6-quart slow cooker
Coat the insert of a 6-quart slow cooker with cooking spray. Toss the waffles, sausage, ham, Cheddar, scallion whites and bell pepper together in a slow cooker. Lay the Swiss cheese over the mixture.
Whisk together the egg yolks, half-and-half, flour, 1 tablespoon salt and 1/4 teaspoon pepper in a medium bowl. Pour over the waffle mixture. Cover and cook until the custard is set, 7 to 8 hours on low. Uncover, sprinkle with the reserved scallion greens and let rest for about 10 minutes before serving. Serve with hot sauce, if using.
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