Preheat oven to 400 degrees and line a large baking sheet with parchment paper.
Drain and rinse the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure maximum crunch.
Cut the chicken breast into small, uniform half-inch cubes to match the size of the chickpeas.
In a medium bowl, whisk together the olive oil, sea salt, garlic powder, smoked paprika, onion powder, and black pepper.
Add the chicken and chickpeas to the bowl, tossing until every piece is evenly coated in the spice mixture.
Spread the mixture in a single layer on the prepared baking sheet, ensuring no pieces are overlapping.
Roast for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden and crisp.
Remove from the oven and immediately sprinkle with nutritional yeast and pumpkin seeds while still hot.
Let the mix cool for 5 minutes to allow the chickpeas to firm up before serving.