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In a large bowl or plastic container, combine the buttermilk, 3 tsp. of the salt, onion powder, and black pepper. Stir until combined. Place the chicken thighs in the buttermilk mixture and toss until coated. Cover and refrigerate for 2 hours or up to overnight.
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In a shallow baking dish or sheet tray, combine the flour, garlic powder and remaining 2 tsp. of salt. Stir until evenly distributed. In another shallow dish, pour the Lee Kum Kee Chiu Chow Style Chili Oil.
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Pull out one chicken thigh and coat in the flour mixture, pressing down firmly, flipping, then shaking off the excess. Repeat for all thighs.
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Fry chicken individually or in small batches at 375°F until brown and crisp and the internal temperature has reached 165°F, about 8 minutes. Remove from hot oil and dip into the Lee Kum Kee Chiu Chow Style Chili Oil and remove, allowing excess to drip off. Drain on a rack or paper towel for 3 minutes.
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Toast the inside of the buns in a lightly buttered sauté pan heated to medium heat, about 1 minute. To assemble, spread 1 Tbsp. of Sriracha Mayo on each bun bottom, top each with a seasoned fried chicken thigh, then 5 pickles. Spread 2 more Tbsp. of Sriracha Mayo on each bun top and place on top of the built sandwich and serve.