Preheat oven to 425°F and line a baking sheet with parchment paper.
Toss diced potatoes with olive oil, salt, and pepper. Spread evenly on the baking sheet and roast for 25-30 minutes, flipping halfway.
While potatoes roast, heat a large skillet over medium heat. Add diced chicken and taco seasoning, cooking until fully cooked through.
Stir in black beans and corn, cooking until warmed.
Once potatoes are done, divide them into meal prep containers.
Top each portion with chicken and bean mixture, shredded cheese, salsa, avocado, and cilantro if desired.
Let cool before sealing and refrigerating for up to 4 days.