Fill muffin pans about 1/2 full with the brioche mixture. Allow it to rise nearly to the top, bake in a slow oven, remove when sufficiently baked, and cool. Remove the center from each mold, leaving a shell. The centers may be toasted and served separately. Put a teaspoonful or two of any desirable preserves or marmalade into the shells, fill with sweetened and flavored whipped cream, and over the top sprinkle chopped nuts. This dessert should be prepared just before serving.