Salmon: Preheat a grill to high. Remove shingles from water and brush with vegetable oil on both sides. Place on the grill and allow to heat through, about 10 minutes. Remove to a sheet pan. Preheat oven to 375 degrees F. Season salmon with salt and pepper, then sear on all sides quickly. Place a salmon fillet on each shingle and cover sheet pan with foil. Place in oven and cook until just done, about 5 to 8 minutes.
Roasted Tomatillo Sauce: Preheat the oven to 350 degrees F. Rub the tomatillos, garlic and onion with olive oil, place on a baking sheet, and roast for 20 minutes or until the tomatillos are soft. Place all the ingredients in a food processor and puree until smooth, season with salt and pepper to taste.
Chipotle Mashed Potatoes: Place potatoes in a large bowl, add butter, warm cream, chipotle puree and garlic and mash until smooth. Season with salt and pepper.