Cheddar Bay Seafood Pie with Shrimp and Crab (Golden Biscuit Topping)

Ingredients

• 4 tablespoons (56 g) unsalted butter
• 1 cup (120 g) diced celery
• 1 cup (150 g) diced yellow onion
• 1 cup (150 g) diced red bell pepper
• 3 cloves garlic, minced
• 1/4 cup (32 g) all-purpose flour
• 1 cup (240 ml) seafood stock or low-sodium chicken broth
• 1 1/2 cups (360 ml) heavy cream
• 1 1/2 teaspoons Old Bay seasoning, plus more to taste
• 1/2 teaspoon black pepper
• 1 lb (450 g) medium shrimp, peeled, deveined, and tails removed
• 8 oz (225 g) lump crab meat, picked over for shells
• 1 cup (115 g) shredded sharp cheddar cheese
• 2 tablespoons chopped fresh parsley
• 1 tablespoon fresh lemon juice
• 1 package (about 11 oz or 320 g) Cheddar Bay biscuit mix
• 1/2 cup (120 ml) cold whole milk, or amount listed on package
• 1/2 cup (55 g) shredded sharp cheddar cheese, if mix does not include cheese
• 2 tablespoons (28 g) melted butter
• 1 tablespoon chopped fresh parsley