Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large mixing bowl, combine flour, baking powder, garlic powder, salt, and sugar.
Add the cold cubed butter to the flour mixture and cut it in with a pastry cutter or your fingers until the mixture resembles coarse crumbs.
Stir in the shredded cheddar cheese and Old Bay seasoning.
Gradually add the buttermilk and mix until just combined.
Gently fold in the chopped crab meat, being careful not to break it apart too much.
Scoop the dough onto the prepared baking sheet, forming about 10-12 biscuits.
Bake for 12-15 minutes or until the biscuits are golden brown on top.
While the biscuits bake, prepare the lemon butter sauce. In a small saucepan, melt the butter over low heat. Stir in the lemon juice, garlic powder, and salt.
Once the biscuits are done, remove them from the oven and drizzle the lemon butter sauce over the top. Garnish with freshly chopped parsley.