01 -
Preheat oven to 425°F (220°C). Coat a 13x9-inch casserole dish with cooking spray.
02 -
In a medium bowl, whisk chicken broth and half-and-half. Set aside.
03 -
Melt butter in a large skillet over medium heat. Add onion, carrot, and celery. Sauté for 10 minutes.
04 -
Stir in flour. Reduce heat to medium-low and continue cooking for 1 more minute. Gradually stir in the chicken broth mixture. Cook, stirring regularly, until thick and bubbly (5-6 minutes). Do not boil. Stir in salt and pepper.
05 -
Stir in cooked chicken and frozen peas. Pour mixture into the prepared baking dish.
06 -
In a large bowl, whisk together flour, cheddar, chives, baking powder, and salt. Add grated butter and cut into the dry ingredients using a pastry cutter or fork until butter lumps are pea-sized.
07 -
Stir in buttermilk until just combined. If the batter is dry, add a little more milk to reach a very thick batter consistency. Do not over-mix; the batter will be lumpy.
08 -
Drop large mounds of biscuit dough onto the chicken pot pie filling in the baking dish.
09 -
Bake the dish in the preheated oven for 23-25 minutes, or until the biscuits are golden brown.
10 -
Brush the tops of the biscuits with melted butter. Serve hot and enjoy.