Preheat oven to 250 degrees and line a baking sheet with parchment paper.
Mix the rice Chex, corn Chex, mini pretzels and candied pecans together in a large bowl.
Melt butter and stir in Worcestershire sauce, seasoned salt, garlic powder and onion powder; pour over Chex mixture and toss to combine.
Spread the mixture on the parchment lined baking sheet and bake in a 250-degree oven for 45 minutes, tossing the ingredients every 15 minutes.
Remove from oven and let cool completely. Add in seasonal candy if desired, and then scoop into ice cream cones to serve.