Preheat the oven to 425°F (220°C) and line a baking sheet with parchment paper.
In a large mixing bowl, whisk together the flour, baking powder, garlic powder, dried parsley, and salt.
Add the cold, cubed butter to the flour mixture. Use a fork or pastry cutter to cut the butter into the flour until the mixture resembles coarse crumbs.
Stir in the shredded cheddar cheese.
Gradually add the buttermilk to the mixture, stirring until just combined. Do not overmix.
Gently fold in the lump crab meat, being careful not to break up the crab chunks.
Using a ¼ cup measuring cup, scoop the biscuit dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for 20-25 minutes or until the tops are golden brown.
While the biscuits are baking, prepare the lemon butter by combining the melted butter, lemon juice, lemon zest, garlic powder, and salt in a small bowl.
Once the biscuits are done, remove them from the oven and brush the warm lemon butter on top of each biscuit.
Garnish with fresh parsley if desired.