Melt the butter in a pan and roast the muesli flakes for about 5 minutes, stirring several times. Cut the almonds roughly into pieces and roast them in a pan without fat for approx. 5 minutes, also while stirring several times. Flakes and almonds can be stored in an airtight container for several days. Put the apricots in a sieve, drain and collect the juice. Halve the apricot halves.
Peel and slice the banana. Mix yoghurt with 2 tablespoons of the apricot juice. Divide the yoghurt, half of the apricots and the banana slices into 2 bowls and sprinkle with half of the muesli flakes and almonds. Decorate with a lemon balm leaf. Put the remaining apricots back into the juice, place in a closed container and use within 2 days