Set aside 1 date per person for garnish.

Warm the milk in a saucepan with the remaining dates for 3–4 minutes until lukewarm.

Grind the oats in the chopper attachment of an immersion blender until they become a fine flour.

Use the immersion blender to puree the heated mixture of milk and dates in the saucepan into a coarse mixture. Make sure there are still visible pieces of date.

Mix the oat flour and peanut butter into the date mixture until you have a smooth, even mass.

Use an ice cream scoop to form balls from the mixture and divide them among glasses or bowls.

Cover the glasses with plastic wrap and refrigerate for at least 6 hours (preferably overnight) to firm up.

Thinly slice the reserved dates and divide them over the glasses just before serving.