Biscuits:
Preheat the oven to 425 degrees.
Take a large bowl and mix flour, baking powder, sugar, and salt.
Add thin slices of butter and mix using your hands.
Pour milk little by little and stir gently with a hand blender or a fork.
Once the dough holds shape, move it to a clean large try or counter.
Fold it over a few times and create a 2-inch-thick layer. Sprinkle some flour on top and roll it flat.
Cut the thick dough sheet into 6-8 squares or circles based on your preference. You can use moulds or simply a small bowl or a glass with a sharp edge.
Stuffing:
Take an oven-friendly large pan and add butter. Melt it in low flame.
Increase to medium flame and toss in the chopped onions, garlic, and thyme. Sauté for 5 minutes.
Add carrots, celery, and salt. Continue to sauté for a few more minutes.
Add the flour and mix it well.
Slowly add the chicken broth and milk. Stir well for a few minutes and let it cook.
The mixture should turn thick and creamy.
Toss in the shredded chicken and peas and mix.
Sprinkle salt, pepper and lemon juice to taste.
Remove the thyme sprigs as the flavour would have been infused by now.
Baking:
Move the mixture to a deep oven-friendly tray or pan. If the one you used for making the stuffing fits, you can use the same.
Now, arrange the biscuits on top of the stuffing. Smear it with a bit of butter for a golden and crisp finish.
Bake for 15-20 minutes until it bubbles. Remove and check if the biscuits are done by piercing it with a toothpick. It should come out clean.
Let it rest for 10-15 minutes before serving.