Bring a large pot of salted water to a boil and cook the lentil pasta according to package directions until al dente.
While pasta cooks, season the chicken breast with sea salt and black pepper.
Heat olive oil in a large skillet over medium-high heat and sear the chicken until golden and cooked through, about 5-7 minutes per side.
Remove chicken from the skillet, let it rest for 2 minutes, then slice into thin strips.
In the same skillet, reduce heat to medium and add the minced garlic, sautéing for 1 minute until fragrant.
Whisk together the Greek yogurt, parmesan cheese, and chicken broth in a small bowl, then pour into the skillet.
Stir the sauce constantly for 1-2 minutes until warmed through (do not let it boil to prevent curdling).
Add the cooked pasta and fresh spinach to the skillet, tossing gently until the spinach is wilted and the pasta is coated in sauce.
Top with the sliced chicken and serve immediately.