Bring a large pot of salted water to a boil and cook the chickpea pasta according to package directions until al dente.
Reserve 0.25 cup of the pasta cooking water before draining the pasta.
While the pasta cooks, season the chicken breast pieces with sea salt and black pepper.
Heat olive oil in a large skillet over medium-high heat and sear the chicken until golden brown and cooked through, approximately 5-7 minutes.
Add minced garlic and red pepper flakes to the skillet, sautéing for 1 minute until aromatic.
Reduce the heat to low and stir in the baby spinach until it begins to wilt.
Whisk together the Greek yogurt, lemon juice, and lemon zest in a small bowl.
Add the cooked pasta and the yogurt mixture to the skillet, tossing gently to combine.
Gradually add the reserved pasta water 1 tablespoon at a time until the sauce reaches a silky, creamy consistency.
Garnish with extra lemon zest and serve immediately.