Preheat your oven to 350°F (175°C). Line a small rimmed baking sheet or a 9×13-inch pan with aluminum foil for easy cleanup, and lightly grease the foil.
In a large mixing bowl, add the ground beef, rolled oats, 3/4 cup of the ketchup, and the kosher salt.
Using clean hands or a sturdy spoon, gently mix just until the oats and ketchup are evenly distributed through the beef. Avoid overmixing so the meatloaf stays tender.
Ground beef and oats being mixed in a bowl
Ground beef and oats being mixed in a bowl
Transfer the mixture to the prepared pan and shape it into a compact loaf about 8 inches long and 4 inches wide, patting the top and sides smooth so it cooks evenly.
Spoon the remaining 1/4 cup ketchup over the top of the loaf and spread it into an even layer, all the way to the edges. This will form the sticky, caramelized red glaze as it bakes.
Unbaked meatloaf with ketchup glaze being spread on top
Unbaked meatloaf with ketchup glaze being spread on top
Place the pan on the center rack of the preheated oven and bake for 45–55 minutes, or until the meatloaf is cooked through and the internal temperature reaches 160°F (71°C). The ketchup glaze should look glossy and slightly caramelized at the edges.
Remove the pan from the oven and let the meatloaf rest for at least 10 minutes on the baking sheet. This helps the juices settle and makes slicing easier.
Using a sharp knife, cut the meatloaf into thick slices directly on the foil-lined sheet. Serve warm, making sure each slice has some of the caramelized ketchup glaze on top.
Freshly sliced meatloaf showing tender interior
Freshly sliced meatloaf showing tender interior
Variations & Tips
To stay true to the 4-ingredient spirit, keep any additions minimal and optional. For a slightly deeper flavor, you can swap part of the ketchup inside the loaf (2–3 tablespoons) with the same amount of Worcestershire sauce, but note that this technically adds another ingredient. If you prefer a bit more sweetness, sprinkle 1–2 teaspoons of brown sugar over the ketchup glaze before baking; as it cooks, it will create an even stickier, caramelized top.
For a leaner version, you can use 90% lean ground beef, but the loaf will be a little less juicy; in that case, avoid overbaking and check for doneness closer to 40–45 minutes. If you only have quick oats, you can use them in place of rolled oats, but reduce the amount slightly to 3/4 cup so the loaf doesn’t become too dense.
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