Keto Cauliflower Cheese Gratin

About this recipe

Cauliflower au gratin is the ultimate keto comfort dish—familiar, luxurious, and unapologetically cheesy without a grain of flour in sight. The challenge most home cooks face is that classic gratin uses béchamel (flour-based), but we're swapping that entirely for a cream-and-cheese sauce that's equally silky without any starch. The result is creamier, actually, since there's nothing to absorb the fat. The almond flour topping is the masterstroke—it mimics the crispy breadcrumb crust and adds textural contrast. Toast it first with butter so it browns instead of steaming. Blanching the cauliflower beforehand ensures it's fully tender by the time the gratin finishes (raw cauliflower won't cook through in 25 minutes). Don't skip this step or you'll bite into half-done florets. Use a mix of cheeses: cheddar for sharp bite and color, gruyère for nuttiness and better melting. Both matter. Store any leftovers covered in the fridge and reheat, covered, at 325°F with a splash of cream stirred in. Reheated gratin is often better than fresh—flavors meld overnight. This easily feeds three as a hearty side or two as a main with greens.