Preheat oven to 180C/350F.
Mix the lentil flour and bicarb soda.
Mash in the sweet potato and combine well.
Line a baking tray with baking paper.
Press the mixture onto the paper (it will be a bit wet and sticky) into the size of a pizza base.
Bake for about 20-25 minutes.
Top with your desired toppings!