In a large mixing bowl, combine the buttermilk marinade ingredients and mix thoroughly.
2 tablespoons grated garlic, 1 tablespoon fresh thyme leaves, 1/2 tablespoon chipotle powder, 1/2 tablespoon smoked paprika, 1/2 tablespoon ground cumin, 1 teaspoon ground turmeric , 1/2 tablespoon freshly ground black pepper , 1 tablespoon kosher salt, 2 cups cultured buttermilk