My supply needs help!!

I had to return to work after my 6wk check up, and would rather not pump while at work. I'm pumping in the AM before work and PM after work as well as EBF when I'm home. I procrastinated and didn't start pumping as early as I should have in order to keep LO off of formula, but now that I'm getting a routine down I'd like to get her back off of formula. Is there anyway I can increase my supply other than pumping throughout the day while at work? Would lactation cookies help here?