These are my ultimate time-savers. I very rarely chop onions or garlic anymore. It’s just too easy to pull them straight from the freezer and add them into the pan or slow cooker. I buy mine from the supermarket but you could also peel, chop and freeze your own.
When a recipe requires one onion use the equivalent amount of chopped frozen onion. It doesn’t matter if it’s a bit more or less. The same with garlic. Most of my recipes state ‘crushed’ garlic, but finely chopped frozen garlic is perfect too.