In a large skillet, melt butter over medium heat. Add onion and garlic, sauté until translucent.

Stir in flour and cook for 1 minute. Gradually whisk in chicken broth and heavy cream.

Add shrimp, lobster, peas, carrots, Old Bay seasoning, salt, and pepper. Cook until shrimp are pink and mixture thickens, about 5-7 minutes.

Transfer the seafood mixture to a baking dish and set aside.

Preheat the oven to 425°F (220°C).

In a mixing bowl, combine flour, baking powder, garlic powder, and salt.

Cut in cold butter until the mixture resembles coarse crumbs. Stir in cheddar cheese.

Add milk gradually until a dough forms. Do not overmix.

Drop spoonfuls of biscuit dough over the seafood filling in the baking dish.

Bake in the preheated oven for 20-25 minutes or until biscuits are golden brown.

Remove from oven and let cool for a few minutes before serving.