In a bowl, mix together the ingredients for the turkey sliders. Use an ice cream scoop or 1/4 cup measuring cup to scoop to measure out each slider to keep them uniform. Alternatively you can measure out full sized burgers.
Set a nonstick skillet on medium heat and once hot, spray with avocado or olive oil, then add the slider patties. Cook for 4 – 6 minutes on each side, or until the top/bottom are browned and the slider is cooked through.
In a carbon steel skillet on medium heat and once hot, add olive oil and onion. As the onions saute and caramelize, add a pinch of sea salt to draw out sweetness. If desired, reduce the onions in 1/2 cup of (chicken/veggie/beef) broth, white wine, or water. Continue cooking until the onions are “wilted,” soft and golden brown, about 15 minutes.
Build the sliders! Toast the buns then add Dijon, lettuce, tomato, cucumber, caramelized onions and the burger!