Preheat your oven to 400°F (200°C).
Place cherry tomatoes on a baking sheet, drizzle with olive oil and a pinch of salt and pepper, then roast for 15 minutes until blistered.
Season the chicken breast with salt and pepper, then sear in a hot skillet for 6-7 minutes per side until golden and cooked through.
Slice the cooked chicken into bite-sized strips.
Bring a pot of salted water to a boil and cook the gnocchi until they float to the surface, which takes about 2-3 minutes.
In a small bowl, whisk together the Greek yogurt, pesto, minced garlic, and lemon juice until smooth.
Drain the gnocchi, reserving two tablespoons of the hot pasta water to thin the sauce if necessary.
Toss the gnocchi, chicken, and roasted tomatoes with the creamy pesto sauce until well coated and serve immediately.