Line a mini muffin pan (24 cavities) with paper liners. Set aside.
In a small pot, combine peanut butter, butter, brown sugar, and a pinch of salt. Cook over medium heat, stirring constantly, until melted and the mixture starts to bubble gently. Remove from heat and stir in vanilla extract. Gradually add powdered sugar, stirring vigorously until fully incorporated and smooth. Press out clumps with a spatula until smooth.
Transfer to a bowl and place in the fridge until chilled through.
Melt half the chocolate wafers with half the coconut oil in the microwave, heating in 30-second intervals and stirring between each interval until smooth.
Spoon about 1 teaspoon of melted chocolate into the bottom of each prepared liner, just enough to coat the bottom. Tap the pan on the counter a few times to level the chocolate. Scoop a teaspoon of the chilled peanut butter filling, roll it into a ball, and flatten it slightly into a disc smaller than the muffin cup’s diameter. Place the disc in the center of each liner on top of the chocolate layer. Repeat with the remaining filling. Pour about 1-1/2 teaspoons of melted chocolate on top of each peanut butter disc to cover it completely. Tap the pan again to level the chocolate. If needed, melt the remaining chocolate and coconut oil.
Refrigerate the peanut butter cups until the chocolate is set. Once set, remove the paper liners and enjoy!
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Notes
Storage: Store homemade peanut butter cups in an airtight container in the fridge. You can also freeze them; just layer them between parchment paper to prevent sticking.