Preheat the oven to 350°F (175°C). Line a cookie sheet with parchment paper.
Mash the banana with a fork until mostly smooth.
Add the sesame seeds and mix until thick and sticky.
Roll into small balls (about 1 tablespoon each), place on the cookie sheet, then flatten gently with the back of a spoon.
Bake for 10–12 minutes until set and lightly golden. Cool 10 minutes.
Melt the dark chocolate, then stir in the peanut butter until smooth and glossy.
Spoon a little chocolate mixture into the center of each cookie.
Top with cashew, pestage, sunflower seeds, and/or pumpkin seeds. Let set before serving.
