01 - Set the oven to 400°F (200°C). Lightly grease a 9x13 inch casserole dish.
02 - In a large skillet over medium-high heat, cook the ground beef, breaking it apart with a spoon, until thoroughly browned, approximately 5 to 7 minutes. Drain any excess rendered fat.
03 - Add the chopped yellow onion and minced garlic to the skillet with the browned beef. Sauté for 2 to 3 minutes until the onion is softened and translucent.
04 - Stir in the frozen mixed vegetables, kosher salt, freshly ground black pepper, and smoked paprika. Cook for an additional 2 minutes, allowing the flavors to meld.
05 - Reduce the skillet's heat to low. Incorporate the condensed cream of mushroom soup and whole milk. Stir until the mixture achieves a smooth consistency and is heated through, about 2 minutes.
06 - Remove the skillet from the heat. Gently fold in the shredded sharp cheddar cheese until it is just melted and evenly distributed throughout the mixture.
07 - Pour and spread the beef mixture evenly into the prepared casserole dish, ensuring an even layer.
08 - Arrange the dill pickle chips or slices uniformly over the beef mixture, creating a distinct layer.
09 - Create a single, even layer of frozen tater tots over the pickle layer. For enhanced crispness, brush the tater tots with the melted unsalted butter.
10 - Bake the hotdish uncovered for 40 to 45 minutes, or until the tater tots achieve a golden-brown hue and the filling is bubbling vigorously.
11 - Allow the casserole to rest for 5 minutes before serving to allow flavors to set.