Prepare rice with water, seasoning and two tablespoons margarine. Sauté onions in 8 tablespoons margarine; add flour until bubbly. Gradually stir in the chicken broth and half & half. Let cook until it thickens. Add sautéed mushrooms, chicken, pea, pimento. Stir into baking dish and bake for 25 minutes at 350º. Top with almonds and bake an additional 15 minutes.