In a medium bowl, combine the part-skim ricotta cheese, grated parmesan cheese, egg yolk, sea salt, and black pepper until smooth.
Gently fold in the all-purpose flour until a soft dough forms, taking care not to overwork the mixture to keep the gnocchi light.
On a lightly floured surface, roll the dough into a long rope and cut into 1-inch pieces.
Season the chicken breast with a pinch of salt and pepper, then pan-sear in a non-stick skillet over medium-high heat until golden and cooked through.
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 separate skillet, melt the unsalted butter over medium heat until it begins to foam and turn a nutty brown color.
Add the fresh sage leaves and minced garlic to the butter, frying for 30 seconds until the sage is crisp and fragrant.
Transfer the cooked gnocchi directly into the sage butter sauce, tossing gently to coat, and serve alongside the sliced chicken breast.