Slice chicken breasts into 1-2" chunks.
Season with salt, garlic powder, pepper, onion powder, and turmeric, coating evenly over all the chicken.
Add to plastic bag with buttermilk and pickle juice.
Refrigerate at least 12 hours, up to 2 days before cooking.
Preheat oven to 350 degrees (if baking) before removing chicken from fridge so it is hot when you're ready.
Arrange 4 large, shallow bowls (salad bowls are great for this) in a line on your workspace.
Add chicken in the buttermilk mixture to one bowl.
Add corn starch to one bowl.
Add eggs to other bowl, beat until slightly foamy, about 1 minute.
Add flour to final bowl.
If frying, add 2-4" peanut oil to a heavy cast iron skillet or heavy pan with a 2"+ lip around the side (I like to fry in a dutch oven personally - less splatter) and heat to between 350-375 degrees.
If baking: Arrange parchment paper on a baking sheet at the end of your dredging assembly line.
Baking or frying: Working with individual chicken bites, or in small batches, move chicken from buttermilk bath to cornstarch, then egg bath, then flour, making sure you get a good, even coat on the chicken. I prefer extra thick breading, and will sometimes dredge three times!
If baking: When chicken has been dredged in egg and flour, place on parchment paper lined baking sheet - give a little space so each can crisp up without over crowding.
If baking: Bake 30 minutes, until chicken has reached internal temperature of 160 degrees and has turned a lovely golden brown.
If frying: fry in small batches until chicken has reached an internal temp of 160 degrees and has browned to a golden brown.
Serve immediately and enjoy!