Preheat the oven to 350F.
In the 1 st bowl, add bread flour, all-purpose flour, baking powder, baking powder, and salt.
Mix the dry ingredients with a spoon and set aside.
In the 2nd bowl, mix egg with egg yolk.
Add brown sugar, white sugar, butter, instant coffee, and vanilla extract and mix.
When the wet ingredients are fully combined, add the dry ingredients in a slow, steady stream to make dough.
Add chocolate morsels and thoroughly combine.
Form small balls, then flatten them into an attractive shape.
Place the cookies 1 1/2 inches apart on a baking sheet or pan and distribute them uniformly.
Bake for 10 to 12 minutes, or until golden brown, at 350 degrees Fahrenheit.
Wait ten minutes as it cools down, then enjoy your Felix Cookie!