In a medium mixing bowl, combine 2 cups of rolled oats, 1 cup of natural peanut butter, and ⅓ cup of honey or maple syrup. Stir well until all ingredients are fully incorporated and form a thick mixture that holds together. If using, add 1 teaspoon of vanilla extract at this stage for an extra flavor boost.

Taste your mixture and, if desired, stir in a pinch of salt to balance the sweetness.

Prepare a muffin tin or a lined dish by lightly greasing it with a bit of cooking spray. Press the oat mixture firmly into the bottom of the muffin tin or spread it evenly across the dish, using your fingers or a spatula to create an even layer.

If you're using dark chocolate chips, now is the time to sprinkle them on top of the pressed oat mixture. Gently press the chocolate chips into the mixture.

Place your muffin tin or dish in the refrigerator and let the mixture set for at least 30 minutes.

Once chilled, carefully remove the No-Bake Peanut Butter Oat Cups from the muffin tin or cut them into squares if using a dish.