Preheat oven to 350. Lightly grease a large baking sheet or line with parchment paper.
In a microwave-safe bowl, gently melt the butter, brown sugar, molasses, cinnamon, ginger, clove, and salt in 30 second increments, stirring between each. My microwave smoothed out the blend in about 90 seconds, but you may need more or less time. Let cool slightly.
In a very large bowl, toss together the Chex cereal, pretzels, cranberries, and walnuts. Use two spatulas or wooden spoons to fold the butter mixture into the Chex combo for 2-3 minutes until everything is well coated. Spread evenly onto the prepared baking sheet. Bake for 20 minutes, tossing 2-3 times in that duration. Let cool for 10 minutes, then break apart any large chunks.
Notes
*To make ahead: Bake the mix as normal. Store in an airtight container at room temperature for up to 3 days.