In a large bowl, mash 1 banana. Add pancake mix, pudding mix, milk, and crushed wafers to the bowl; stir until combined.

Grease a large nonstick skillet with cooking spray and warm over medium-low heat.

Pour a 1/4 cup batter for each pancake (about 2-3 per pan) and cook until golden brown, about 2 minutes per side. Work in batches, repeat with remaining batter.

Slice the second banana. Put one pancake on the plate, add whipped cream, banana slices, repeat for 2-3 layers. Top the stack with whipped cream, bananas, crushed Nilla wafers, and drizzle with syrup.