Dumplings:
Line rimmed baking sheet with plastic wrap. Whisk first 5
ingredients in medium bowl. Stir in milk and butter, then chives
and fennel. Let stand at least 1 hour and up to 2 hours. Using wet
hands, shape mixture, 1 tablespoon at a time into 18 dumplings,
arranging on sheet.
Soup:
Heat oil in large pot over medium heat. Add onion, garlic, bay leaves,
and thyme. Sauté until onion is tender, about 5 minutes. Add sausage;
sauté until fat renders, 3 to 4 minutes. Add broth, tomatoes with juice,
hot sauce, and allspice; bring to simmer, stirring occasionally.
Add greens to simmering soup. Cook greens uncovered 10 minutes,
stirring occasionally. Drop in dumplings. Cover; reduce heat to low.
Simmer until dumplings are tender and cooked through, 20 to 25
minutes. Add salt and pepper to taste.