In a medium-sized mixing bowl, whisk the flour, baking powder, and salt; set aside.
Using an electric mixer beat together the butter and sugar.
Add eggs one at a time.
Add in the flour mixture and stir until just combined.
Add the fennel seeds and mix in well.
Add the chocolate chips and stir to combine.
Turn dough out onto a parchment-lined baking sheet and form into a log - roughly 16x4 inches.
Bake at 350°F until light golden brown; about 30 minutes.
Remove the cookie brick from oven and cool on wire rack for 30 minutes
Using a serrated knife, cut into ¾-inch thick diagonal slices.
Place cut side down onto parchment lined baking sheet, and return to 350°F oven for 15 minutes.
Cool completely on a wire rack before eating or storing in airtight container.