Heat the olive oil in a large skillet over medium heat. When the oil is shimmering, add the onion and cook until starting to soften and caramelize, about 10 minutes.
Increase the heat to medium-high and add the ground turkey. Season with the salt and hearty spice blend. Cook, stirring occasionally, allowing the turkey to brown slightly. Once the turkey is cooked through, about 8 minutes, remove the pan from the heat.
Heat the tortillas in a clean skillet over medium heat or directly over a medium-low flame on a gas stove. Wrap the hot tortillas in a clean kitchen towel to keep warm as you heat the remaining tortillas.
Assemble the tacos: Fill the hot tortillas with the turkey filling and garnish with 1 tablespoon salsa and 1 tablespoon cotija cheese. Serve with lime wedges on the side.