Preheat or set oven temperature to 400 degrees.
In a skillet, on medium high heat saute carrots, onion, celery and garlic in butter until they soften, between 5 and 10 minutes.
Whisk together flour and ¾ cup of water until smooth and lump free.
Add stock, vinegar, garlic and onion powders, sugar and herbs to the skillet
Simmer on medium high for 10 minutes until slightly reduced, whisking in the flour/water mixture during the last couple of minutes. Salt and pepper to taste
While the skillet is simmering, mix up the biscuit dough. Combine dumpling ingredients by mixing flour, baking powder, soda, sugar and salt; cut in the shortening until mixture resembles fine crumbs.
Add buttermilk and mix until sticky dough is formed.
Remove skillet from heat. Mix in chicken pieces and peas.
Drop dollops of biscuit dough evenly into the skillet
Bake in a 400 degree oven for 20-25 minutes, until tops are golden brown and crispy.