Line a loaf tin with parchment paper. Preheat the oven 160°C.
Mash the bananas with a fork, then add the milk and vanilla.
Mix the flour, ground almonds and baking powder in another bowl.
Combine the two mixtures, then fold in the linseed mix.
Tip the batter into the loaf tin, spreading it out evenly. Scatter the almond flakes over the top, then bake in the middle of the oven for approx. 45-55 minutes until it’s golden, and an inserted skewer comes out clean.
Rest the cake in the tin for five minutes, then transfer it to a wire rack and let it cool completely before serving.