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Gently mix the ground beef, minced yellow onion, minced garlic, breadcrumbs, egg, Worcestershire Sauce, salt, and freshly ground black pepper in a large bowl. Using a 1 1/2 tablespoon scoop for equal proportioning, roll the meatballs and place them on a baking sheet covered with parchment paper. Place the baking sheet in the fridge and let the meatballs chill for 30 minutes
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Heat 2 tablespoons olive oil in a skillet over medium to medium-high heat. Add the meatballs to the skillet and brown them. Work in batches and do not crowd the pan. Add more oil if needed. Remove the meatballs to a plate and cover to keep warm.
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Add the butter to the same skillet over medium to medium-low heat. Add the onions and cook until they are soft and lightly browned on the edges, about 7-10 minutes. Sprinkle the onions with the garlic powder and flour. Cook for 2 minutes over medium-low heat while stirring constantly.
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Slowly pour in the beef broth while stirring. Simmer for several minutes until thickened. Season with salt and freshly ground black pepper to taste. Add the browned meatballs back to the skillet and simmer for about 8-10 minutes. Sprinkle with chopped fresh thyme.
