Brush the bottom and sides of a 9-in. pie plate with 2 tablespoons oil; sprinkle with bread crumbs. Set aside.
In a skillet, saute mushrooms in remaining oil; drain. Remove from the heat. Squeeze spinach dry; add to mushrooms. Stir in artichokes, bread cubes, 1 cup of cheese, pimientos, eggs and garlic powder; stir well.
Spoon into the prepared pie plate. Bake, uncovered, at 350° for 30 minutes. Sprinkle with remaining cheese. Bake 5-10 minutes longer or until the cheese is melted. Let stand for 10 minutes before cutting.