Preheat your oven to 425°F and line a baking sheet with parchment paper.
In a small mixing bowl, combine the shredded chicken with chili powder, cumin, garlic powder, sea salt, and black pepper until evenly coated.
Warm the corn tortillas in the microwave for 20 seconds between damp paper towels to make them pliable and prevent cracking.
Place a portion of the seasoned chicken in the center of each tortilla, roll tightly, and place them seam-side down on the prepared baking sheet.
Lightly brush the tops of the rolled tortillas with olive oil to ensure they get golden and crisp in the oven.
Bake for 12 to 15 minutes, or until the edges of the tortillas are browned and crunchy.
While the flautas bake, combine the avocado, Greek yogurt, lime juice, and cilantro in a small blender or food processor and blend until completely smooth.
Remove the flautas from the oven and serve immediately with the creamy avocado sauce on the side for dipping.