Preheat the oven to 325°F. Coat a baking sheet with nonstick cooking spray.
Heat the olive oil in a medium skillet over medium heat. When the oil is shimmering, add the garlic and onions and cook until the onions are soft and translucent about 3 minutes, then sprinkle with ¼ teaspoon salt. Continue cooking onions and garlic until they are slightly browned, about 2 more minutes. Set the skillet aside to slightly cool for 5 minutes.
Transfer the slightly cooled onions and garlic into a large bowl. Add the Worcestershire sauce and tomato paste and stir to coat vegetables. Add the ground beef, breadcrumbs, eggs, the remaining ½ teaspoon salt, and pepper. Using clean hands, mix the ingredients until well combined.
Using a standard ice cream scoop, portion the meatballs onto the prepared baking sheet for a total of 16. Using your clean thumb, make a small groove onto the top of each meatball to create a space for the ketchup.
Drizzle ½ teaspoon of the ketchup onto each meatball using the ketchup squeeze bottle or using a spoon.
Place the baking sheet into the oven and bake until a thermometer inserted into the center of several meatballs reaches 155°F, about 15 minutes. Remove the baking sheet from the oven and set aside for the meatballs to cool, about 10 minutes.