1. Preheat oven to 400°. Melt butter in a large skillet over medium-high heat. Add cauliflower and next 2 ingredients; sauté 10 minutes or until golden and just tender. Sprinkle with flour and next 2 ingredients; stir well. Remove from heat.
2. Spoon cauliflower mixture into an 11- x 7-inch baking dish, and drizzle with cream. Sprinkle with Gruyère cheese and next 3 ingredients.
3. Bake at 400° for 18 to 20 minutes or until golden.