Preheat the oven to 350 degrees F. Preheat the grill to medium-high heat.
02For the garlic butter: Place the garlic in a small saute pan and set over medium heat. Add the butter and warm through. Cook the garlic until fragrant, 4 to 5 minutes. Then place the garlic butter in the fridge to firm up again.03For the blistered chile: Toss the poblano with olive oil to coat. Place the pepper under the broiler or char on the grill over a direct flame until the skin blisters. When done, remove the seeds, stem and roughly chop. Reserve.04For the onions and peppers: Set a large saute pan over high heat. Add a drizzle of olive oil and saute the onions and bell peppers until wilted, 5 to 6 minutes. Season with the paprika and some salt and pepper.05For the turkey burgers: In a large mixing bowl, combine the turkey, mustard, Worcestershire, cumin, white pepper and the reserved blistered chile. Sprinkle with kosher salt. Mix gently until well combined. Form into four 4-ounce burger patties. Wipe the grill down with oil-blotted towels, and then place the burgers on the hot grill and cook for 3 to 4 minutes. Flip the burgers, top with a slice of cheese and cook until cooked through and cheese has melted, 3 to 4 minutes. Set aside and allow to rest.06Smear the buns with the garlic butter. Grill the buns until golden and crispy, 20 to 30 seconds on each side.07To build the burgers, place 1 grilled turkey burger on the bottom half of the bun. Then top with a good heaping of sauteed onions and peppers. Finish with the top half of the bun and skewer to hold all of it together. Serve with extra mustard on the side.