Preheat oven to 400°; boil a large pot of salted water, add half the box of pasta + cook 10-12 min or until al dente; drain + return to pot

Meanwhile, tear corner of cauliflower rice to vent + heat in microwave 90 sec (careful—it'll be hot!); if using a skillet, warm 2 min with 1 tbsp water

Add ¼-½ cup sauce, cauliflower + salt/pep to pasta; toss to coat noodles

Transfer pasta mixture to a lightly oiled baking dish + sprinkle on ½ cup cheese (or more!); bake 15-17 min until cheese is melted + bubbling

Top with freshly chopped chives; let set 5 min before scooping + digging in—yum!