Preheat oven to 400 degrees.
Dice the cauliflower into bite-sized chunks.
Toss the cauliflower with olive oil, salt, and pepper, and place in a 2 quart baking dish.
Bake for 20 minutes, stirring halfway through.
While cauliflower is baking, prepare the cheese sauce.
Heat the cream in a small sauce pan over medium heat and whisk in the cheeses and ground mustard. Continue whisking over medium heat until cheese has melted and sauce is smooth and creamy.
Remove the cauliflower from the oven and pour the cheese sauce over the top. Stir to coat all of the cauliflower in the cheese sauce.
Stir together the almond meal, melted butter, parsley, garlic powder, and garlic salt. Sprinkle over the cauliflower mixture.
Turn the oven to broil and return the cauliflower to the oven. Broil for 1-2 minutes or until the almond meal is browned.
Let set for 5 minutes before serving.