Preheat the oven to 350°F and line a baking sheet with parchment paper. Spread the pecans, oats, pepitas, and almonds on the sheet and bake about 8 minutes or until fragrant. Transfer to a large mixing bowl.
In a saucepan, bring the sugar, honey, pumpkin butter, butter, and salt to a boil over medium heat. Make a light caramel sauce by simmering until the sugar dissolves completely, about 5 minutes. Remove from heat and pour the caramel over the nut and oat mixture. Stir in the brown rice cereal and the cranberries until evenly coated.
Line an 8-inch square baking pan with parchment paper, extend the paper over the sides of the pan to use as a handle later. Pour the cereal mixture into the baking dish and spread out into an even layer. Cover the pan with a second piece of parchment and press down very firmly to compress the bars so that they don’t fall apart when you remove them from the pan. Let the mixture stand for about 2 hours until firm.
Discard the top piece of parchment and use the “handles” from the second piece of parchment to gently remove the cereal square from the pan then cut the squares into 12 equal size bars and serve.