If you're using store-bought chicken pieces, air fry or bake them at 400 degrees F for 8 minutes (air fryer) or 12 minutes (oven), the proceed to step 7. If you're making your own chicken proceed to step 2.
In a bowl, beat the egg with 2 teaspoons of water.
In another bowl, combine the flour, cornstarch, garlic powder, salt, and pepper. Mix well.
Heat oil in a deep skillet or fryer to 350°F (175°C).
Dip the chicken in the egg, allowing excess to drip off. Dredge each piece in the seasoned flour mixture.
Fry the chicken in batches until golden brown and cooked through, about 4-5 minutes per side. Remove and drain on paper towels.
Mix together the mayonnaise, sweet chili sauce, sriracha, salt, and pepper.
Slice the slider buns in half horizontally, keeping the top and bottom connected. Toast the buns. Place the bottom buns on a serving platter. Spread the lettuce and cilantro among the buns, then add the chicken to each bun. Drizzle the sauce over the top. Cut the sliders into 12 and serve hot.