I compared Costco and Trader Joe's butter croissants in a head-to-head battle, and only one had pastries I'd purchase again. The Costco croissants were not only cheaper, but also tasted way better.

Insider has tried hundreds of Trader Joe's products and compiled a list of the best things to snag, from breakfasts and frozen food to fan favorites.

The front sign of a Trader Joe's - Danilo Oliver/Getty Images Trader Joe's frozen aisle is probably the last place you would think of when you've got a sweet tooth. Amongst all those bags of frozen ...