how can Iake store bought cookie dough taste better?

sprinkle with maldon salt!

Make them and donate them to the school bake sale. Win-win.

when i hear 'store bought cookie dough', i think:
too sweet( waaay more sugar than needed) and one dimensional flavor. I don't know what monster cookies are, but my first thought is to decrease the sweetness by adding espresso powder to taste. Also more of everything except sugar.
I would begin by finding a recipe for a homemade version of that dough. Then let the purchased dough get to room temp; put it in a mixer; add pre-softened butter, espresso powder, flour, salt and leavening, other additions (nuts, dried fruit etc.) Mix the dough for a brief time, so it doesn't get overworked and tough.

Hm, never tried this. Depending on the type of dough, I'd suggest adding a few tablespoons of softened butter and dark brown sugar to make it taste more homemade -- also perhaps some vanilla extract (most cookies will benefit from extra vanilla anyway). You could also add in some mix-ins: crushed pretzels, cereal like cornflakes or Grape-nuts, shredded coconut, etc. to detract from any "store-bought" taste. Final thought: Make homemade cookie dough ice cream with it!

Oops, that should be make not iake