Thinly slice the yellow onion.
Heat the olive oil in a non-stick skillet over medium-low heat. Add the onions and a pinch of salt, cooking for 10-15 minutes until they become soft and jammy.
Remove the onions from the skillet and set aside. Increase the heat to medium and add the ground turkey to the same pan.
Cook the turkey, breaking it apart with a spatula, until browned and cooked through.
Stir in the tomato puree, coconut aminos, dijon mustard, smoked paprika, garlic powder, sea salt, and black pepper.
Lower the heat and let the mixture simmer for 5 minutes until the sauce has thickened and coated the turkey.
Lightly toast the whole wheat slider buns in a separate pan or toaster.
Assemble the sliders by spooning the smoky turkey mixture onto the bottom buns, topping with the caramelized onions, and closing with the top buns.