My little chef is 4 now, so I'm trying to remember what he was doing a year and a half ago

. He would stir things in a bowl. He would stand on a stepstool in front of me and we'd chop things together (both of our hands on the knife handle, mine covering his) - this has paid off in that he has learned how to handle a knife and is now starting to do it on his own. Same thing with peeling carrots with a vegetable peeler.
He'd "make" the salads by dumping handfuls of prechopped veggies in a giant bowl or on individual salad plates. He would turn the oven on, and turn on the light to watch whatever was in it. He'd measure rice and water into the rice cooker, then press the button to start it - he was always proud of making the rice all by himself

. He also liked to start the kitchen timer (after I entered the time), and let me know when it went off ("Mommy, it's time!!").
It was about that time that I started teaching him to crack eggs in a bowl, although he didn't do it consistently until he was 3. He could also dip chicken breast cutlets in scrambled egg or milk, and then in breadcrumbs - perfect messy job for a toddler! I didn't worry about him touching raw eggs or meat, just made sure to wash his hands carefully afterward.
Nowadays, he does more chopping himself. He uses a kid-sized butter knife to butter bread or toast. He cracks all of my eggs, and can separate the white from the yolk (I have him crack the whole thing into a bowl, then use his fingers to lift out the yolk, or use an egg separator). He loves the KitchenAid, can lock the bowl and turn it on to a specific number. He's also good with a potato masher, a whisk and an egg beater (good for more than just scrambling eggs, btw!). Best of all, he actually LIKES to set the table!!
My next goal is to teach him to use an ulu in a wooden bowl, which is nice because you don't have to have your other hand near the food that's being cut - it stays in place at the bottom of the bowl, while the left hand holds the bowl in place.
It does take quite a bit longer to use a 2.5 yr old's "help", but I thought of it as an investment of time now so that they could really learn how to do it and be an actual help later. No different from teaching him to tie his own shoes (much faster to do it for him) or anything else. At 4, he loves to cook with me, and is actually very helpful at some things! So stick with it, even if it's frustrating at times.