I tried to find the recipe my mother used to make....this isn't exactly it, but close...

Cheerio Snack Mix
5 cups MultiGrain Cheerios®
1 cup pretzel sticks
1/4 cup peanut butter
1 tablespoon light margarine
1 cup raisins
1 cup peanuts

Heat oven to 350°.
Stir together cereal and pretzels in large bowl.
Heat peanut butter and margarine to boiling in 1-quart saucepan, stirring occasionally.
Pour over cereal and pretzels, stirring until evenly coated.
Spread in ungreased rectangular pan, 13×9x2 inches.
Bake 10 minutes, stirring occasionally. Stir in raisins and peanuts. Spread on waxed paper to cool. Store in airtight container.
16 Servings.

Hers didn't use peanut butter....