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Arrange a rack in the middle of the oven and heat the oven to 375°F. Lightly coat a 9x13-inch baking dish with cooking spray or oil; set aside.
Heat the oil in a large frying pan over medium heat until shimmering. Add the sausage and cook, breaking it up into small pieces with a wooden spoon, until browned and no longer pink, 6 to 8 minutes.
Add the onion, bell pepper, and ¼ teaspoon of the salt. Cook, stirring occasionally, until the vegetables are softened, about 5 minutes. Transfer the mixture to the baking dish, add the potatoes, stir to combine, and spread into an even layer.
Whisk the eggs in a large bowl. Add the sour cream, milk, mustard, cheese, remaining ½ teaspoon salt, and pepper and whisk to combine. Pour over the vegetable mixture.
Bake until the top is light golden-brown and a knife inserted in the middle comes out clean, about 45 minutes. Let cool for 5 minutes before slicing.