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Add the cauliflower and broccoli florets to a large saucepan and cover with water. Bring to a boil, then reduce to a simmer. Cook for 4-5 minutes until just tender. Drain completely and set aside to steam dry. While the cauliflower is cooking, roughly chop the sausages into bite-sized chunks. Heat the olive oil in a skillet over a medium heat. Add the sausage pieces and cook until browned all over.
To prepare the sauce, melt the butter in a small saucepan over a low/medium heat. Crush the garlic and add to the pan, sweating until tender. Add the cream cheese, stock, salt, pepper and mustard powder. Stir well to combine. Bring to a simmer until the cream cheese has melted and you have a smooth sauce.
Add half a cup of grated cheddar cheese and the parmesan to the saucepan. Stir well to combine until the cheese has melted. You should have a smooth and creamy sauce.
Preheat the oven to 400 degrees Fahrenheit. Select a medium-sized oven-proof dish. Arrange the part cooked cauliflower and broccoli in the base of the oven dish. Arrange the sausage pieces in amongst the vegetables in an even layer.
Pour the creamy cheese sauce over the vegetables and sausages. Make sure everything is covered evenly in the sauce. Sprinkle the remaining grated cheese over the top of the sausages and vegetables. Transfer to the oven and bake for 20-25 minutes or until piping hot through, bubbling, and golden.