Slice the cod fillets into 1-inch-wide strips and pat dry thoroughly with paper towels.
In a shallow dish, whisk together the cornstarch, smoked paprika, garlic powder, salt, and pepper.
Dredge each cod strip in the seasoned cornstarch, then shake off the excess until only a faint coating remains.
Melt the butter in a large skillet over medium heat. Add the minced garlic and stir for about 30 seconds, until fragrant and pale gold.
Lay the cod strips into the garlic butter in a single layer, leaving space between each piece. Sear 2–3 minutes per side, until golden and opaque throughout.
Spoon the remaining butter over the strips for the last 30 seconds of cooking, then remove from heat. Squeeze fresh lime juice over the top and sprinkle with lime zest. Let rest 1 minute in the pan.
While the cod rests, whisk together the sweet chili sauce, lime juice, minced garlic, fish sauce, honey, and red pepper flakes in a small bowl. Taste and adjust with extra lime or honey as needed.
Transfer the cod strips to a serving plate, spoon any remaining pan butter over the top, and garnish with chopped parsley. Serve with the sweet chili lime sauce alongside.