Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Toss the cherry tomatoes with the olive oil and a pinch of the sea salt and black pepper, then roast for 12 minutes until they begin to burst.
While tomatoes roast, bring a medium pot of salted water to a boil and cook the gnocchi until they float to the surface, then drain immediately.
Season the chicken breast with the remaining salt and pepper, then sear in a non-stick skillet over medium-high heat for 5-6 minutes per side until fully cooked.
Slice the cooked chicken into bite-sized strips and set aside.
In a small mixing bowl, whisk together the basil pesto, Greek yogurt, and lemon juice until the sauce is smooth and creamy.
In the same skillet used for the chicken, combine the cooked gnocchi, sliced chicken, roasted tomatoes, and baby spinach.
Pour the creamy pesto sauce over the ingredients and toss gently over low heat for 1 minute until the spinach is just wilted and the sauce is warm.