Preheat oven to temperature indicated on the bag of tater tots.
Meanwhile, heat a large, oven-safe skillet (11-3/4" minimum) over medium-high heat then add breakfast sausage and cauliflower and saute until sausage is cooked through. Turn heat down to medium then sprinkle in flour and cook for 1 minute. Slowly pour in add milk while whisking until a smooth sauce has formed then turn heat up to medium-high to bring milk to a simmer. Season with a pinch of seasoned salt and a generous amount of black pepper. Once simmering, turn heat down to medium then simmer until milk has thickened slightly, 3-4 minutes. It shouldn't be soupy but the milk will continue to thicken and reduce while baking so you want to make sure there's enough liquid so the final dish comes out creamy.
Remove skillet from heat then arrange tater tots in a circular pattern. Some will sink down farther than others and that's fine! Bake for amount of time indicated on the tater tot bag, or until tater tots are golden brown, then let dish sit for 5 minutes before serving.
Notes
I have made this dish many times with unsweetened almond milk with great results. Use 2% milk fat or higher if using cow's milk