Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
Toss the cherry tomatoes with half of the olive oil, sea salt, and black pepper, then roast for 15 minutes until they begin to burst.
Bring a pot of salted water to a boil and cook the potato gnocchi according to package directions until they float, then drain and set aside.
Slice the chicken breast into bite-sized pieces and season with the remaining salt and pepper.
Heat the remaining olive oil in a large skillet over medium-high heat and sear the chicken until golden brown and cooked through.
Reduce the skillet heat to low and add the basil pesto, Greek yogurt, and lemon juice, stirring to create a smooth, creamy sauce.
Add the fresh baby spinach to the pan and stir for 1 minute until just wilted.
Fold the cooked gnocchi and roasted tomatoes into the pan, tossing gently to coat everything in the pesto sauce before serving.