Preheat oven to 400 degrees. Lightly grease a 9x13 baking dish. Cook broccoli and cauliflower, set aside. Add oil to a skillet and heat over medium-high heat. Stir in onions and cook for 2 minutes.
Add garlic and cook for 20 seconds. Stir in smoked sausage and cook for 3 minutes, or until browned on all sides. Stir frequently.
Combine broccoli, cauliflower, sausage in a mixing bowl and combine cream cheese, mayonnaise, 1 cup shredded cheese, dijon mustard, salt, and pepper; mix until thoroughly incorporated. Add remaining shredded cheese on top. Bake for 20 minutes, or until cheese is melted and top is golden brown.
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