I have two fourteen year old boys that are like your son...want to cook but it needs to be easy and fast so they don't loose interest.
I finally resorted to writing "3" step recipies on 3 index cards per recipie. If you counted them, the steps are actually two-three steps bundled into one, but by emphasising "3" steps, they think it's easier.
When writing recipies, I've found that it's best to over-explain yourself. It's better they think you're a dork for writing down "obvious" steps than to leave them confused and wondering "how does mom do it".
Example: Quick Chicken Parmesean
Step 1: Bake Chicken Strips.
Place frozen chicken strips on an aluminum-lined cookie sheet. Top strips with sliced mozzerella, sprinkle of italian seasoning, sprinkle of paresean cheese. Bake in oven according to directions on frozen chicken's bag.
Step 2: Cook Noodles & Sauce
Use one of the larger "soup" pots. Fill halfway with water and set on stove over medium-high heat. When the water is boiling, sprinkle with salt, then toss in spagetti noodles (a small package or one fist-full from a large package). (Make sure noodles are fully submerged.) Boil for 10-11 minutes.
Meanwhile, open a can of spagettii sauce and cook in a sauce pan at med/low heat.
Step 3: Arrange and Serve.
TURN OFF OVEN AND ALL BURNERS. Drain noodles and arrange on plates. Add a slice of mozzerella cheese. Pour sauce over noodles & cheese. Add desired number of chicken strips (usually two per plate). Drizzle with a little more sauce. Top with sprinkle of italian seasoning and parmesean cheese.