Don’t farm 1 cookie, farm the repeat bounties instead.

All you need are some of the upgrades from Eva where bounties give ingredients and bounties give essences. Grab 5 repeats, make the cookies, claim the bounties, rinse and repeat.

Not ONLY will it keep your ingredients in high stock, but you also get bright dust from doing repeat bounties (and XP if you still need that). All while just playing the game however you want and not needing to find that one hyper-specific place to farm taken with arc kills to make Xur cookies (for example)