Spoon this 1 blanket over roast beef in a roasting pan for a cozy cold-weather meal that’s ridiculously satisfying

In a medium bowl, stir together the sour cream, prepared horseradish, Dijon mustard, minced garlic, chopped chives, remaining 1/2 teaspoon kosher salt, and 1 teaspoon black pepper until smooth and well combined. Taste and adjust with a bit more horseradish or pepper if you like more kick.
Pour the beef broth or water into the bottom of the roasting pan, being careful not to wash off the seasoning on the roast. This helps keep the oven moist and creates a little jus for serving.
Using a spoon (or a small spatula), spoon this 1 blanket of horseradish-sour cream mixture all over the top and sides of the raw beef eye of round roast in the roasting pan. Aim for an even, fairly thick layer that completely covers the meat; it will cling and set as it bakes.
Place the roasting pan on the middle rack of the preheated oven. Roast for about 55 to 75 minutes, depending on the size of your roast and your preferred doneness, until a meat thermometer inserted into the thickest part reads about 125°F (52°C) for medium-rare or 135°F (57°C) for medium. Start checking at 50 minutes to avoid overcooking, since eye of round is lean.
As the roast bakes, the blanket will set, turn lightly golden in spots, and drip flavorful juices into the pan. If the pan looks very dry at any point, carefully splash in a bit more broth or water.
When the roast reaches your desired internal temperature, remove the pan from the oven. Transfer the roast carefully to a cutting board, keeping as much of the creamy blanket on top as possible. Tent loosely with foil and let it rest for 15 to 20 minutes; the temperature will rise a few degrees as it rests and the juices will redistribute.
While the roast rests, skim any excess fat from the pan juices and stir them together to make a simple jus. If you’d like it a bit richer, you can simmer the juices in a small saucepan for a few minutes to reduce slightly.
After resting, slice the roast thinly against the grain. The eye of round will be most tender when sliced thin. Spoon some of the pan juices over the slices and sprinkle with a little extra chopped chives for color, if you like. Serve warm with your favorite cozy sides.
Variations & Tips
For a milder flavor, cut the prepared horseradish down to 2 tablespoons and add an extra 1/4 cup sour cream. For more heat, increase the horseradish to 1/3 cup and add a pinch of cayenne pepper to the blanket. If you don’t have chives, finely sliced green onions or minced fresh parsley work well and still give that fresh, herby finish. To make this a more complete one-pan meal, tuck halved baby potatoes and thick carrot chunks around the roast before spooning the blanket over the meat; they’ll roast in the drippings and broth, though you may need to add an extra splash of liquid and extend the cook time slightly. If you’re watching dairy, you can swap the sour cream for plain Greek yogurt, understanding that the blanket will be a bit tangier and may brown faster—just tent with foil if it darkens too quickly. Leftovers keep nicely in the fridge for up to 3 days and are great sliced thin for sandwiches or reheated gently in a covered dish with a spoonful of broth to keep everything moist.