Heat avocado oil in a large cast-iron skillet over medium-high heat.
Add the diced sweet potatoes and cook for 5-7 minutes, stirring occasionally, until they begin to soften and turn golden brown.
Add the ground turkey to the skillet, breaking it up with a spatula, and cook until fully browned and no longer pink.
Stir in the diced bell peppers and red onion, sautéing for another 3-4 minutes until the vegetables are tender-crisp.
Sprinkle the sea salt, black pepper, smoked paprika, and garlic powder over the mixture and stir to combine.
Reduce the heat to medium and pour the liquid egg whites evenly over the turkey and vegetable mixture.
Gently scramble the mixture with a spatula until the egg whites are fully set and fluffy.
Fold in the baby spinach and cook for 1 minute until just wilted.
Remove from heat, top with sliced avocado, and serve immediately.