1Heat oven to 350°F. In large bowl, mix cereal and pretzels.
2In 1-quart saucepan, heat peanut butter and butter to boiling, stirring occasionally; pour over cereal mixture. Toss until evenly coated. Spread in ungreased 13x9-inch pan.
3Bake 10 minutes, stirring occasionally. Stir in peanuts. Spread on waxed paper to cool, about 1 hour.
4Stir in banana chips and raisins. Store in airtight container.