Melt 3 tablespoons of butter in a Dutch oven or large saucepan.
Add carrots, celery, and onion to pot and sauté until the veggies begin to soften, about 3 minutes.
Add in garlic and continue sauteing for another minute.
Add in flour and continue cooking for 2 minutes.
Pour in chicken stock, garlic powder, Italian seasoning, and bring to a simmer.
Cover pot with a lid and simmer for 10 minutes.
While pot is simmering away, make the dumpling dough. In a mixing bowl stir all-purpose flour, baking powder, salt and rosemary together.
Make a well in the dry ingredients and add in the olive oil and milk. Gently stir until just combined.
After the stew has been simmering for 10 minutes, add in the cooked chicken and heavy cream. Bring back to a simmer.
Season to taste with salt and pepper.
Drop spoonsful of dough approximately 2 tablespoons in size each into the simmering pot.
Cover the pot with a lid and continue simmering for 22-25 minutes to allow the dumplings to steam. Add the frozen peas and cook for 1-2 minutes. The dumplings should be light and fluffy when fully cooked. You can check for doneness by removing a dumpling and cutting it open.
Garnish with fresh parsley, serve, and enjoy.