Preheat oven to 180c
Line a 12 cup muffin tin with muffin cases
In a large bowl whisk together the pumpkin puree, egg replacer, oil and sugar, until smooth
Add the flour, baking powder, bicarb, salt and vanilla extract. Stir until just mixed and you can't see anymore flour.
Fold in the chocolate chips.
Spoon the mixture into your prepared muffin tin and bake for 25 minutes
Leave to cook in the tin for 5 minutes, then remove to a cooling rack.