Heat the oven to 400°F. Line a rimmed baking sheet with parchment paper. Place the sweet potato cubes in a pot, cover with water, and bring to a boil. Cook until very tender, about 15 minutes.
While the potatoes cook, combine the ground turkey, egg, almond flour, chopped onion, garlic powder, Italian seasoning, ½ teaspoon of the salt, and black pepper in a mixing bowl. Mix gently until just combined.
Divide the turkey mixture into four portions and shape each into a small oval loaf. Arrange the loaves on the prepared baking sheet and brush their tops with 1 tablespoon of olive oil.
Bake the mini meatloaves until cooked through and their centers reach 165°F, about 20 to 25 minutes.
Drain the sweet potatoes well and return them to the pot. Add the almond milk, remaining 1 tablespoon olive oil, and remaining ¼ teaspoon salt. Mash until smooth, then serve with the meatloaves.