In a medium size bowl, whisk together a.p flour, baking powder, and salt. Set aside.
In another bowl, toss together the crushed potato chips or crushed pretzels, chocolate chips or butterscotch chips, oats, raisins or white chocolate pieces and coffee grounds.
In a large bowl using a food processor or by hand cream together the butter and sugar until light and fluffy. Add the egg, egg yolk and vanilla extract, beat again until completely combined, scraping down the sides and bottom of the bowl as necessary.
Add the flour mixture and mix until the dough just about comes together. Add all of the bowl of mix-ins, and fold carefully with a spatula so not to over mix the dough or break too many of the chips or pretzels. Mix until everything is well combined. Roll the dough into balls to your desired size. Place them on a baking sheet, cover cookie dough balls and chill in the refrigerator at least 1 hour or up to 4-5 days.
Preheat the oven to 350°F when ready to bake.Line two large baking sheets with parchment paper and place chilled dough balls on them (no more than 8 dough balls)).Bake the cookies for 12-13 minutes. The center of the cookies may seem under-baked and some cookies spread unevenly. You could reshape them while they are still hot using a cookie cutter or use a spoon to tuck in the edges.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely. Enjoy! ***See notes for storage.