Mix dry ingredients, add milk gradually, and beaten egg; then add olive oil. Shape, using a hot timbale iron, fry in deep fat until crisp and brown; take from iron and invert on brown paper to drain.
Heat fat until nearly hot enough to fry uncooked mixtures. Put iron into hot fat, having fat deep enough to more than cover it, and let stand until heated. The only way of knowing when iron is of right temperature is to take it from fat, shake what fat may drip from it, lower in batter to three-fourths its depth, raise from batter, then immerse in hot fat. If batter does not cling to iron, or drops from iron as soon as immersed in fat, it is either too hot or not sufficiently heated.
Turn timbale batter into a cup. Lower hot iron into cup, taking care that batter covers iron to only three-fourths its depth. When immersed in fat, mixture will rise to top of iron, and when crisp and brown may be easily slipped off. If too much batter is used, in cooking it will rise over top of iron, and in order to remove timbale it must be cut around with a sharp knife close to top of iron. If the cases are soft rather than crisp, batter is too thick and must be diluted with milk. Fill cases with Creamed Oysters, Chicken, Sweetbreads, or Chicken and Sweetbreads in combination with Mushrooms.