Spicy Pepperoni Biscuits

From: Christmas with Southern Living 1998
Ingredients:
2 cups flour
1 tbsp baking powder
1/2 tsp salt
1/2 tsp dry mustard
1/4 tsp ground red pepper
1/3 cup shortening
1/2 cup finely chopped pepperoni
3/4 cup milk

Combine first five ingredients; cut in shortening with a pastry blender until mixture is crumbly. Stir in pepperoni. Add milk, stirring just until dry ingredients are moistened. Turn dough out onto a lightly floured surface; knead 3 or 4 times. Roll dough to 1/2" thickness; cut dough with 2" or 2 1/2" biscuit cutter, and place biscuits on a lightly greased baking sheet. Bake at 425 for 13-15 minutes or until lightly browned.

What I did differently from the recipe: Nothing.

What I'll do differently next time: Put more pepperonis in.

Verdict: Why do my biscuits always turn out crumbly?? I think these could have been delicious...