Combine egg yolk, almond flour, oat milk, and honey and mix well. (If you have vanilla essence, add 3-4 drops.)
Simmer slowly over medium-low heat. (Wait until it gradually thickens without boiling vigorously.)
Chill the mixture in the refrigerator for about 30 minutes.
Mix Greek yogurt into the cooled mixture, then add sliced banana and soft egg biscuits and combine well.
Let it mature in the refrigerator for 1-2 hours before serving.