Season 5 large chicken breasts with salt, pepper, and garlic powder. Bake in a shallow dish with 2 T. water at 350° for 30-45 minutes until done. Cut into 1/2" cubes when cool enough. Toast almonds on baking sheet at 375° for 5 minutes. Combine tarragon and vinegar in small pan and simmer on medium low just until dry, about 10 minutes. Combine all ingredients and toss. Serve on a bed of lettuce or in a wrap with lettuce