Pizza Base of scone with dairy-free cheese and herbs

25g dairy-free margarine
125g gluten-free plain flour 
a pinch of xanthan gum (1/8 teaspoon)
1/2 teaspoon gluten-free baking powder
1/2 teaspoon dry mustard powder
1/2 teaspoon salt
1 medium-sized onion, peeled and grated
75g dairy-free cheese 
1/2 teaspoon mixed herbs
1 medium egg
1 tablespoon dairy-free milk 

Pre-heat your oven to 200'C / 400'F / Gas 6.

Lightly grease a baking tray.

Sieve the gluten-free flour with the xanthan gum then add all the rest of the ingredients. 

Mix with a wooden spoon to form a dough.

Turn out onto a floured surface and knead lightly.

Shape into a round measuring 20-23cm and place on the prepared baking sheet. 

Arrange the topping of your choice and bake in a pre-heated oven for 20-25 minutes.