2 large egg whites
2 Tbsp water
6 cups snack mix (such as Chex Mix or Asian rice cracker mix)
Preheat the oven to 325 degrees. Beat the egg whites and 2 Tbsp water in a large bowl with a mixer until slightly stiff peaks form. Add the snack mix and toss until evenly coated.
Generously coat a 3-quart ovenproof bowl with cooking spray and place the snack mix in it. Crumple a large sheet of foil and mold it into a bowl shape about 1/3 the size of the 3-quart bowl. Coat the outside of the foil bowl with cooking spray and press into the snack mix to make a well in the middle, forming the snack mix into a bowl shape.
Place the bowl with the foil in the oven and bake until the snack mix sets - 30 minutes. Remove from the oven and let cool slightly (about 5 minutes). Carefully remove the foil. Cool 30 more minutes, invert the edible bowl onto a plate and cool completely. Fill with your choice of snack mix.