Place the top oven rack in the center position and pre-heat oven to 400°F.
Place potatoes and garlic in a large pot and add water until thepotatoes are completely covered, with an additional inch or two on top. Bringto a rapid boil over high heat for 15 minutes, or until the potatoes are forktender. Remove from heat, drain, and set aside.
While the potatoes are boiling, add the beef, rosemary, andWorcestershire sauce to a 10” cast iron skillet set over medium heat. Seasonwith salt and black pepper, to taste, and stir to combine. Cook, stirringfrequently, until the beef is completely browned and broken into small pieces,approximately 8-10 minutes.
Remove skillet from heat and carefully drainany excess fat from the skillet, if necessary. Set aside.
Add chicken stock, heavy cream, and butter to theboiled potatoes. Season with salt and black pepper, to taste, and mash with ahand masher or whip with a hand mixer until smooth. If necessary, add a littleextra chicken broth to reach the desired consistency. Set aside.
Evenly spread the thawed corn, peas, andcarrots across the browned ground beef in the cast iron skillet. Top with aneven layer of the mashed potatoes and sprinkle with some smoked paprika.
Place the skillet in the pre-heated oven andbake for 30 minutes, or until heated through and the potatoes are nicelybrowned on top. Remove from oven and cool slightly. Serve immediately garnishedwith fresh chives. Enjoy!