Preheat the oven to 375°F and lightly grease a standard muffin tin. Prepare the biscuit dough with the water and shredded cheddar amounts directed on your package. Stir in the garlic powder and Italian seasoning just until combined.
Combine the mayonnaise, mustard, paprika, and onion powder in a bowl. Stir in the crushed crackers and Parmesan, then gently fold in the drained cooked crab. Add a small spoonful of extra mayonnaise only if needed for the filling to hold together.
Divide the dough into about 10 equal portions, depending on the package size. Reserve a small piece of each portion for a lid. Press the larger piece into a greased muffin well with the back of a lightly floured spoon, covering the bottom and sides and leaving a hollow center.
Add about 1 to 2 tablespoons of crab filling to each dough cup, adjusting to its size. Keep the filling below the dough rim so there is room to seal the lid. The filling is generous; prepare additional biscuit dough as needed if you want to use it all.
Flatten the reserved dough into lids, place them over the filling, and gently press the edges into the dough rims. Patch any gaps so the filling is fully enclosed. Repeat with the remaining portions.
Bake on the middle rack at 375°F, beginning to check after 12 to 15 minutes. Filled biscuits often need around 20 minutes or longer, depending on size and pan. Bake until the tops are golden, the sides are set, and the dough beside the filling is fully baked. Open one to check for a wet, gummy dough layer and continue baking if necessary.
Combine ¼ cup melted butter with 1 teaspoon lemon juice. Brush a thin layer over the warm biscuit tops. This lemon butter replaces the mix package’s separate finishing topping.
Let the biscuits settle in the pan for about 5 minutes, then gently loosen the edges and lift them out. Serve warm.