In a medium mixing bowl, combine the Greek yogurt, creamy peanut butter, maple syrup (or honey), and vanilla extract. Stir until completely smooth and creamy.
Line a loaf pan, small baking dish, or silicone mold with parchment paper for easy removal.
Spread the mixture evenly into the prepared pan and smooth the top using a spatula.
Sprinkle mini chocolate chips evenly over the top, followed by a pinch of flaky sea salt. If desired, add chopped roasted peanuts or drizzle with melted dark chocolate.
Freeze for 2 to 3 hours, or until the Healthy Peanut Butter Frozen Bites are completely firm.
Remove from the freezer and let sit for 2 to 3 minutes before slicing into bite-sized squares or removing from the molds.
Serve immediately and store leftovers in an airtight freezer-safe container.