Sauté the aromatics. Heat olive oil and melt butter in a large skillet set over medium-high heat. Stir in Italian Seasoning and cook for 10 seconds. Add onions and mushrooms; season with salt and pepper and cook for 5 minutes, stirring frequently. Stir in the garlic and cook for 20 seconds.
Add broth and riced cauliflower. Stir in the broth. Add the cauliflower rice and mix and stir until incorporated. Continue to cook, uncovered, for 5 minutes, or until tender. Stir frequently.
Stir in the cheese. Add the Asiago cheese and stir until melted.
Serve. Remove the cauliflower rice from the heat, garnish with freshly chopped parsley, and serve.