In a bowl, mix together all-purpose flour, baking powder and cocoa.
Chop chocolate bar into uniform pieces. In a large heatproof bowl set over a pot of simmering water, put the chocolate pieces into the bowl. Stir until chocolate pieces are melted and mixture is smooth. Remove the bowl from the pot, add olive oil to the bowl whisking constantly. Then add egg one at a time whisking constantly. Whisk in sugar. Then add flour mixture to the bowl and fold in cherries. Mix to blend well.
Put the batter into lightly greased 9-by-5-by-3-inch loaf pan and bake in a preheated 325 degrees F oven for 25-30 minutes. Let cool on wire rack.
When the brownie has cooled completely, remove the brownie from the pan and cut the brownie into your desired size.