For the burgers: Slice the green onions thin then roughly chop. Combine the ground chuck with the green onions, salt, pepper and olive oil. Mix by hand until just combined, then form 12 mini burgers. Place on a preheated grill pan over medium high heat (adjust if you need to while the burgers cook), cook 3-5 minutes per side or until cook through. Flip and repeat. You can place the finished burgers on a plate and cover with foil to keep warm while finishing the other burgers. Toast buns if desired then top the bottom bun with a slider, cheese, pickle, lettuce, sauce, then top with the top half of the bun.