1In a large bowl, combine the all-purpose flour, cornstarch, salt, black pepper, garlic powder, and onion powder.
Dip each chicken tender into the buttermilk, then dredge in the flour mixture, ensuring each piece is well-coated.
Heat oil in a deep fryer or large pot to 350°F (175°C).
Fry the chicken tenders in batches until golden brown and cooked through, about 6-8 minutes per batch. Drain on paper towels.
In a small saucepan, combine the gochujang, soy sauce, honey, rice vinegar, minced garlic, and sesame oil. Cook over medium heat until the sauce thickens, about 5 minutes.
Toss the fried chicken tenders in the gochujang sauce until well-coated.
Assemble the sliders by placing a piece of sauced chicken on the bottom half of each slider bun. Top with shredded lettuce and pickled radish.
Place the top half of the slider bun on each sandwich and serve immediately.