As I said, with the amount of margarine in the dough, these tarts should come out of the muffin tins will no problem. However, it’s important to make the dough as thin as possible without causing any tears or holes in the crust. When placing the dough in the muffin tins, tamp it down gently with your fingers or a tart tamper to completely cover the inside of the muffin tin. If there are any tears or holes, the filling will leak and then there will definitely stick to the tin.