Line two baking sheets with parchment paper. In a large bowl, use your hands to toss together the cereals, marshmallows, M&Ms, and almonds. 

Place the white chocolate into a microwave-safe bowl and microwave at 50 percent power for 30 seconds. Stir. Repeat at 15-second intervals until the chocolate is smooth and pourable.

Pour the melted chocolate over the cereal mix and stir to coat everything with the chocolate. Turn the snack mix out onto the two baking sheets and spread to the edges. Let cool before breaking into bite-sized pieces. Store in an air-tight container.