In a heatproof jug, microwave the butter and brown sugar for about 1 minute. Whisk well.
Preheat oven to 180c.Line a brownie pan with greaseproof paper.
In a large bowl, sift together the cocoa powder, baking powder, flour and salt.
Mix the milk and essences into the melted butter/sugar. Pour over the dry ingredients and stir just until you can't see any dry clumps of flour.
Fold in the choc chips, walnuts and pear chunks.
Pour your mixture into your prepared baking pan and bake for about 20 minutes. Check for goo after about 15 mins.
Remove from oven and let cool completely until removing from the brownie pan. Cut into squares and serve!