Line a 15x10x1-in. pan with parchment, letting ends extend over sides; set aside. Freeze pretzels, miniature marshmallows and baking chips 1 hour., Remove pretzels, marshmallows and baking chips from freezer; combine in a large bowl. In a Dutch oven, melt butter over medium heat. Heat 10-13 minutes or until golden brown, stirring constantly. Add large marshmallows; cook and stir until blended. Remove from heat; stir in vanilla and salt., Stir in cereal until coated. Stir in pretzel mixture; transfer to prepared pan, pressing evenly with a buttered spatula. Cool completely., Lifting with parchment, remove cereal mixture from pan. Cut into bars. Store in airtight containers.