Add 2 Tbs. butter to your cast iron over medium heat and sautee diced onion, celery, and carrot until onions are translucent. About 5 minutes.
Add garlic and sautee for 30 seconds, until fragrant.
Sprinkle with flour and stir.
Slowly add in chicken stock, stirring constantly to prevent clumping.
Stir in herbs. I like to crush mine to prevent large pieces.
Allow to simmer for 30 minutes over medium heat, until reduced by about 25%.
While the vegetable mix simmers, finish biscuits (directions below)
Once reduced, stir in chicken, cream, and peas to the pan.
Salt and pepper to taste.
Top with biscuit dough and bake at 400 F for 30 minutes