Double Slants

The concept

Two receivers on the same side both breaking inside, stacked so one defender is between them.

The offense1 / 3
The look
Two receivers stacked on one side, both breaking inside — the outside man at three yards and the inside man just behind him, on staggered tracks.
vs Man2 / 3
The conflict
Two inside breaks from outside leverage. Both defenders are running across the field with no help inside them.
vs Man3 / 3
The throw
Whichever slant the inside defender does not take. Fast, flat and off the back foot.

Why it works

One defender caught between two inside breaks
He can wall off the first slant or sit for the second. Whichever he does, the other one is throwing space.
The stack takes the jam away
The inside receiver cannot be pressed, because there is a receiver standing between him and anyone who would do it. He gets a clean release every time.
It is a completion, not a shot
Both routes are caught in stride moving toward the middle of the field, which is the safest throw a young quarterback makes.

Running both slants at the same depth
Level with each other they arrive in one window and a single defender takes them both. The stagger is what makes it two routes.
Throwing the first slant because it is first
The read is which one is uncovered, not which one is nearer. First is a habit, not a progression.
Calling it into inside leverage
Slants thrown at a defender already sitting inside is throwing to the defense. Against a squatting linebacker, run the same picture and break out instead.

Open it in the designer, change the routes, save it to your playbook.