Wash mushrooms, remove and chop stems, reserving 1 tablespoon.
Dip each mushroom cap into the oil, and place into rectangular dish or ring mold. (If using rectangular dish, larger caps should be placed in the corners.)
Mix remaining ingredients (except pecan halves) and stuff caps with mixture.
Top each cap with a pecan half.
Cover with plastic wrap and cook 15 minutes on high in microwave oven.
Let stand for five minutes before serving.
Recipe by ILovePecans at https://ilovepecans.org/pecan-and-chicken-stuffed-mushrooms/