Slice the chicken breast into thin strips and season evenly with sea salt, black pepper, and dried oregano.
Heat the olive oil in a medium skillet over medium-high heat and sear the chicken for 5-6 minutes until golden brown and cooked through.
While the chicken cooks, rinse the chickpeas thoroughly in a fine-mesh sieve and pat dry.
Dice the cucumber and red onion, and halve the cherry tomatoes.
In a small bowl, whisk together the tahini and lemon juice until smooth, adding a teaspoon of water if needed to reach a drizzling consistency.
Place the baby spinach in a large bowl and top with the warm pan-seared chicken and chickpeas.
Arrange the cucumber, tomatoes, and red onion on top, then finish with a dollop of hummus and a drizzle of the lemon-tahini dressing.