Preheat the oven to 180°C and line a baking tin with parchment paper.
In a bowl, mash the bananas and strawberries together with a fork until mostly smooth.
Add the almond butter and vanilla extract, then mix well.
Stir in the oats and ground almonds until fully combined. The mixture should be soft but not too wet—add a little more oats if needed, or a splash of almond milk if it feels too thick.
Let the mixture rest for a few minutes to allow the oats to absorb some moisture.
Transfer the mixture to the prepared tin and spread it out evenly.
Bake in the oven (or air fryer) for about 20 minutes, until lightly golden and set.
Allow to cool on a wire rack before cutting into squares.
Serve as they are, or with a spoonful of Greek yogurt and fresh fruit.