In a medium mixing bowl, combine the Greek yogurt, peanut butter, maple syrup or honey, and vanilla extract.
Stir until the mixture is smooth and creamy.
Line a loaf pan or silicone mold with parchment paper.
Spread the peanut butter mixture evenly into the prepared pan and smooth the top with a spatula.
Sprinkle the mini chocolate chips and flaky sea salt over the surface.
Add chopped roasted peanuts or drizzle melted dark chocolate if desired.
Freeze the Healthy Peanut Butter Frozen Bites for 2–3 hours, or until completely firm.
Remove from the freezer and let sit for 2–3 minutes before slicing or breaking into bite-sized pieces.
Serve immediately or return any leftovers to the freezer.