Cheesy cauliflower bake smothers tender cauliflower in a rich cheese sauce for a satisfying vegetarian family side. A great lower-carb alternative to au gratin potatoes that supports keto and calorie deficit goals.
Preheat your oven to 400°F and butter a 2-qt baking dish for even heating and easy serving.
Steam cauliflower florets for 7–9 minutes until just fork-tender but not mushy; drain well and pat dry.
Melt unsalted butter in a large skillet over medium heat. Whisk in milk, cream cheese, garlic powder, onion powder, salt, and pepper, stirring until cream cheese is smooth and sauce is lightly thickened, about 3–5 minutes.
Lower the heat to low and add shredded cheddar and half the Parmesan gradually, whisking constantly until fully melted and velvety.
Layer steamed cauliflower in the prepared dish, pour cheese sauce evenly over, and gently toss to coat every floret. Sprinkle remaining Parmesan on top.
Bake uncovered for 20–25 minutes until golden and bubbling. Rest for 5 minutes after baking for optimal texture before serving.