Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Rinse the chickpeas and pat them very dry with a clean kitchen towel to ensure they become crispy during roasting.
Cut the chicken breast into one-inch cubes and place them on the baking sheet along with the dried chickpeas.
Drizzle the olive oil over the chicken and chickpeas, then sprinkle with sea salt, black pepper, smoked paprika, and garlic powder.
Toss everything directly on the pan to coat evenly, then spread into a single layer.
Roast for 20 to 22 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden and crisp.
While the pan is in the oven, whisk the tahini and lemon juice in a small bowl, adding a teaspoon of warm water at a time until it reaches a smooth, pourable consistency.
Divide the baby kale and sliced cucumber between bowls, top with the warm roasted chicken and chickpeas, and finish with the lemon-tahini drizzle.