Get prepped: Preheat the oven to 160°C fan/180°C/350°F/Gas Mark 4 and line a 20x20cm cake tin with parchment paper.
Whisk the batter: Use an electric hand whisk or wooden spoon to beat the butter and sugar together until pale and fluffy.
Mix in the eggs, one at a time, then mix the almond extract in.
Prep the berries: Mix 2 tbsp of the flour with the blackberries in a bowl and set to one side. (This helps to stop them sinking too much.)
Finish off the cake mix: Mix in the rest of the flour to the batter then use a spoon to stir in the blackberries. (See the notes below about adding a little milk if your batter is too stiff.)
Into the tin: Pour the mixture into the lined baking tin and gently smooth the top with the back of the spoon then scatter over the flaked almonds.
Time to bake: Bake for 30-35 minutes until a skewer comes out of the centre cleanly.
Before serving: Leave to cool in the tin for 10 minutes before placing on a cooling rack.
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