Put half of each of the first six ingredients in a food processor (the entire amount will not fit in a standard food processor). Process until smooth. Spoon into the baking dish. Top with half the asiago cheese. Repeat.
Bake at 400 for 30 minutes or until golden, bubbly, and hot.
To Make Roasted Garlic: slice the head down the middle exposing the cloves, drizzle with olive oil, season with salt and pepper, wrap in foil and bake for 30 minutes at 400. The cloves will soften enough to squeeze out of the bulb. The best part is this reheats well. Feel free to bake it the day before and then just microwave to reheat.Heavy Cream: when using frozen cauliflower it is watery enough that cream isn't needed. The cream is optional and I tend to only use it when I use fresh cauliflower.