Place 10 tablespoons (approximately 10-15ml each) on a lined baking tray. Use a wooden spoon to prop up handle end of spoons to sit flat.
Melt 4 marshmallows in a microwave-safe bowl on medium-low heat for 15 seconds or until smooth. Divide among 5 spoons.
Place 1/2 tsp Top ‘n’ Fill in each remaining spoon. Spread to flatten slightly. Sprinkle Top ‘n’ Fill spoons with a little sea salt.
Place spoons in the fridge for 10 minutes to set.
Meanwhile, melt 100g dark cooking chocolate in a microwave-safe bowl. Spoon chocolate among spoons, taking care not to overfill. Set aside for 10-15 minutes to set slightly.
Decorate with Mini M&M’s and baby cachous.
Place in the fridge for 1 hour to set. Allow to stand at room tem