2. Now, you need to whisk together the flour and baking powder in a small bowl to remove any lumps.
3. Next, beat together the butter with all of the white sugar, brown sugar, and sugar blend in a large bowl until everything is well combined. Then, fully stir in both the egg and vanilla extract, beating the mixture is completely combined and until smooth. Next, add the full flour mixture and blend until just combined, taking care not to overbeat the batter.
4. Next, you need to gently fold in the white chocolate chips, milk chocolate pieces, candy corn, and almonds into the batter. Gently combine until all the add-ins have been fully incorporated into the batter. You should do this by hand as to not destroy or crush all of the candy pieces. Now, spread the batter evenly into the prepared pan.
5. Next, bake the mixture in the pan in the preheated oven until a toothpick inserted in the center comes out completely clean with no batter on it. This process should take between 30 to 35 minutes, depending on the oven. Let cool for at least 30 minutes before cutting into bars.

Source: thisdelicioushouse.com