1 teaspoon vegetable oil, plus more for brushing the baking dish
4 frozen waffles
4 small red potatoes, very thinly sliced
Kosher salt and freshly ground black pepper
1 small red bell pepper, stemmed, seeded and chopped
3 scallions, sliced, white and green parts separated
3 scallions, sliced, white and green parts separated
2 cloves garlic, thinly sliced
1 1/2 cups shredded Cheddar (about 6 ounces)
1 cup whole milk
2 large eggs
8 breakfast sausage links, halved lengthwise