How to Make It
Preheat broiler to high with oven rack in upper middle position.
Microwave cauliflower according to package directions until tender. Combine cauliflower and cheese in a food processor; process until smooth.
Heat oil in a large ovenproof skillet over medium-high. Add turkey, and cook, breaking up with a spoon, until turkey begins to brown, about 4 minutes. Add carrots, zucchini, onion, and peas; stir to combine. Add salt, and cook, stirring often, 4 minutes. Add flour and 1 teaspoon thyme; stir to combine. Increase heat to high, and add chicken stock. Cook, stirring constantly, until mixture thickens. Spoon cauliflower mixture over turkey and vegetable mixture in skillet, smoothing top with a spoon; sprinkle with pepper.
Broil until cauliflower topping is golden brown in spots, 3 to 4 minutes. Sprinkle with additional thyme leaves. Serve immediately.