I grew herbs for the first time this year and froze chives, oregano and onion. To freeze chives, I grabbed a small handful and cut them up fine with scissors into a bowl, then filled ice cube trays 2/3 full. Fill with water just until they begin to float. I finally figured out to use a measuring spoon TBL to have good control and in most cases it takes about a TBL of water per cube. Freeze, then finish filling the trays so the ones that floated to the top will be encased in ice. Remove and store in freezer bags. Each ice cube contains 2-3 teaspoons of chives. Drop in soups or other dishes where a little extra water doesn't make a difference. For omelets or "no added water dishes", put the ice cube in a tea strainer and run water over it to melt the ice. Works great!
(I do put a small dish of baking soda in the freezer next to the trays to absorb odor. After I'm done, I soak the trays 1/2 full of full-strength white vinegar overnight, pour out the vinegar into a jar for use in cleaning, wash the trays, fill with water and make ice cubes and throw out the first batch. Not sure that's necessary but I didn't want to taste them to find out. Haven't had a problem with onion tasting ice even when there is still a trace of onion odor on the trays.)
For oregano, I picked off the leaves and spread them out in a single layer in a cake pan, froze them and put them in a pint jar in the freezer.
Raw onions are not my thing, but I like them cooked in food. Generally I use co-op dehydrated onions because they're easier, taste good to me (unlike store bought ones), and I don't have the mess every time I want a little bit and then either waste what's left over or smell up my refrigerator. Worse yet, I forgot I had them earlier this year and it took a while to find what was causing that awful smell in my home - rotten onions! Anyway someone gave me onions I didn't want to waste so I chopped them up, spread them out in a single layer in a pan and froze them, then put them in a jar in the freezer. Now when I'm cooking, I have onions ready to go without any fuss or mess.