Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Drain and rinse the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure they achieve maximum crispiness.
Cut the boneless, skinless chicken breast into 1-inch bite-sized cubes so they cook at the same rate as the chickpeas.
In a large mixing bowl, combine the dried chickpeas and chicken cubes with the extra virgin olive oil, sea salt, black pepper, dried oregano, and garlic powder.
Toss the mixture until every piece is evenly coated in oil and spices, then spread it in a single layer on the prepared baking sheet.
Roast for 20 to 25 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the chickpeas are golden and crunchy.
Remove the tray from the oven and immediately drizzle the fresh lemon juice over the hot chicken and chickpeas to brighten the flavors.
Place the fresh baby spinach in a serving bowl and top with the hot roasted mixture, allowing the residual heat to gently wilt the greens before serving.