Prepare apples: Wash and core your apple, then cut it. Start with quartering the apple and slice into smaller sections from there. Aim to make each slice 1/4-inch thick or less.
Assemble apples: On a large plate, layer your apple slices as you would nacho chips. Reduce the amount of space between each slice so toppings don't fall through, but don't overlap them too much. The goal is for each apple slice to have an even layer of topping.
Melt peanut butter: In a microwave safe dish, heat your peanut butter until just melted, about 20-seconds. If you don't have a microwave, melt it in a small saucepan over medium-low heat.
Add toppings: While it's still warm, drizzle the peanut butter over your apple slices. Sprinkle granola and other toppings as desired. Enjoy immediately!
Notes
Nutrition facts calculated with 1 tbsp each of peanut butter and granola.