Grate the potatoes and squeeze to remove as much moisture as possible.

In a large bowl, beat together egg, potato flour, baking powder and salt.

Mix in potatoes and chopped onion. The mixture will appear relatively dry, but ensure it is as mixed as possible.

Heat oil of choice (I used peanut oil) in a large skillet over medium heat.

Spread the entire mixture across the skillet and allow the bottom to cook. Flip carefully to cook the other side. Set aside until ready to assemble.

Combine all ingredients in a small bowl until well mixed.

Set aside 1/4 cup for use on the base.

Place the chicken in a saucepan of boiling water and poach until cooked through.

Set aside to cool and shred into bite-sized pieces.

Place in the remaining sauce mixture and stir until well coated.

Assemble the pizza by spreading the reserved sauce on the potato base, then placing chicken, pepper and spinach in top.

Bake in a pre-heated 375F oven for 10 minutes.