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Preheat oven to 350° F. Roll out puff pastry with a rolling pin on a floured surface. Line a tart mold with the pastry and prick the dough with a fork so it doesn't puff up. Refrigerate for 15 minutes.
Mix dulce de leche, media crema, eggs and walnuts together. Pour half of the mixture into the puff pastry and top with a layer of banana slices. Pour the rest of the mixture over the bananas and top with remaining banana slices.
Bake for 30 minutes or until a wooden pick inserted comes out clean; serve warm.