Vegetable cheese with mini roasties

How do you get veg into a veg dodger?  Particularly "but it's not even Christmas" sprouts.  Smother it in cheese sauce, that's how.

Mini "roasties"

Chop potatoes and roast in hot oil for about 50 minutes.

For veg

Kale
Cauliflower
Sprouts
Butter
Flour (gf for us)
Milk (Soya for us)
Wholegrain mustard
Cheddar

Steam the veg.
Make a roux by melting the butter, then stirring in the flour until smooth.  Gradually add milk, keep stirring until sauce thickens and is smooth - using a whisk helps reduce lumps.  Add a teaspoon of wholegrain mustard and shed loads of grated cheese.
Put the veg in an oven dish, top with even more grated cheese and bake while the potatoes finish.
Serve, scoff, watch veg dodger have thirds.