Once the dumpling dough is in the fridge, finely dice the carrots and celery, thinly slice the mushrooms, and mince the garlic. Set aside.
Add the olive oil to a large pot and turn on the heat. Once the oil is hot, add the diced onion and minced garlic to the pot. Stir and sauté together for 2-3 minutes.
Add in the remaining vegetables including the diced carrots, diced celery, and sliced mushroom. Stir and cook with the onions and garlic for 8-10 minutes until the vegetables have cooked down and are beginning to brown.
Next, add the tomato paste, Worcestershire sauce, and dried parsley to the pot of vegetables. Stir and saute everything together for an additional 1-2 minutes. You can also add salt & pepper to season to your liking at this time.
Once the vegetables are cooked down, add the vegetable broth and cooked cannellini beans to the pot. Then, stir together and bring the stew to a simmer.