Preheat oven to 175 degrees C

Line an 8x8 inch baking tin with parchment paper and set aside

In a large bowl mix peanut butter, sugar, vanilla and milk

Sift in the flour and baking powder and mix together

Using your hands mix flour through until well combined, the mix should be a thick, firm dough

Press mixture into the lined tin.

Press chopped Lindt chocolate into the top and place into the oven

Bake for up to 22 minutes or until it starts to go slightly golden brown on the edges

Leave to completely cool (otherwise will crumble when cutting) and cut into desired size

These are quite filling so I suggest cutting them small