Classic Southern Chicken and Dumplings

1 yellow onion, diced

2 carrot, peeled and diced

2 celery, diced

4 garlic, minced

3 thyme, sprigs

15 g parsley, chopped, for garnish

1.5 kg chicken thighs, bone-in, skin-on

60 g unsalted butter, cubed

120 ml heavy cream

60 g unsalted butter, cold, cubed

180 ml whole milk, cold

150 g frozen peas, thawed

15 ml vegetable oil

45 g all-purpose flour, for dusting and thickening

1.5 L chicken stock, low-sodium

250 g all-purpose flour, for dumplings

15 g baking powder

10 ml kosher salt, divided

5 ml black pepper, freshly ground

2 bay leaf

5 ml kosher salt, for dumplings