Preheat the oven to 350°F and line a muffin tin with parchment paper liners.
Combine the almond flour, baking powder, and salt in a medium sized bowl and whisk unitl combined.
Add in the maple syrup, eggs, vanilla, and peanut butter and mix with a wooden spoon until a batter is formed.
Use an ice cream scoop to scoop the batter into the muffin liners filling them about 3/4 of the way full.
Unwrap the peanut butter cups and genlty push one into the top of each muffin.
Bake the muffins for 15-18 minutes until the tops are golden brown.
Let the muffins cool in the pan before eating.
Notes
Depending on the brand of peanut butter cup you use, it may crack and melt while baking. It's okay! It gives the muffins a homemade and rustic look. I love it! And they'll still taste good. :)