Preheat oven to 375°F. Line two baking sheets with parchment paper. Melt the butter in a small sauce pan on low heat. Meanwhile, put the sugar into a mixing bowl. Pour the melted butter on top of the sugar and mix well with a wooden spoon. Break the egg into the bowl, and add the vanilla. Mix until the mixture is well blended.
Add the flour, baking powder, and salt into the mixing bowl, and stir until all the ingredients are well combined, then stir in the chocolate and granola. Use a tablespoon to place dollops of the mixture on the lined baking sheets, leaving plenty of space in between them – the cookies really spread out! You can flatten the dough with your palm to help the cookies spread out. Put the baking sheets in the oven and bake for 8 to 10 minutes, until the cookies are just turning golden brown.
After removing from the oven, leave the cookies on the baking sheets to cool for a couple of minutes, then carefully transfer them to a wire rack.