I've been trying to find this fic for months now, and I apologize in advance if someone's already searched for it here. I remember I read it on archiveofourown.org.
It has Tony offering up the tower to the avengers, but Clint and Bruce are the only ones to take him up on that offer at first. Anyway, Clint cooks a lot, and Bruce takes off to India a few times. One time he comes back with spices that he's excited for Clint to try out in a recipe. It's just a really great bromance one, and specifically I remember in one chapter there was a recipe concerning hamburger and chili and it's all wrapped up and sounds ridiculously delicious.
Please please help me find it! Thanks!