Lox and Eggs with Onions

Name: Lox and Eggs with Onions
Prep time: 5 min
Cook time: 15 min
Total time: 20 min
Cuisine: American
Ingredients: Olive oil spray; 1 tablespoon unsalted butter (or dairy free butter); 1 small yellow onion (quartered and cut into ¼-inch slices (about 1 1/2 cups)); 4 large eggs; Kosher salt; Freshly ground black pepper; 3 ounces sliced Nova lox (chopped); Chopped chives or scallion greens (for garnish)