In a large bowl, combine cereal squares, pretzels, and pumpkin seeds.
Melt margarine in a microwave-safe bowl in a microwave. Whisk together margarine, Worcestershire sauce, garlic and onion powders, and salt and pepper to taste.
Toss cereal mixture with margarine and spice mixture until well combined.
Spread in an even layer on a baking sheet.
Bake for 25 minutes, stirring every 10 minutes or so.
Let cool. Add cornflakes.
Nutrition Info
107 Calories, 1 g Protein, 15 g Carbohydrates, 5 g Total fat (1 g sat, 2 g mono, 1 g poly), 129 mg Sodium