Step 1: Preheat your oven to 425°F (220°C).
Step 2: Prepare the potatoes by scrubbing, peeling, and cutting into thick chips. Toss with olive oil, garlic, 2 teaspoons of Old Bay seasoning, and salt.
Step 3: Bake the chips in a single layer for 30-35 minutes, flipping halfway through.
Step 4: Prepare the fish batter by mixing low-fat buttermilk with the remaining Old Bay seasoning and whisking together flour and egg whites in a separate bowl.
Step 5: Coat the fish by dipping it in the buttermilk mixture, then in the flour mixture, and finally rolling in Panko breadcrumbs.
Step 6: After 15 minutes of baking the chips, add the coated fish to the baking sheet and bake for an additional 12-15 minutes.
Step 7: Serve with lemon wedges and tartar sauce or malt vinegar.