1/2 cup cooked crumbled bacon, or precooked bacon bits
4 cups mini marshmallows
5 tbsp butter
Blend cereal, rolled oats, ground flax seeds, chopped pecans, and bacon in a bowl. In a 4-quart pot, melt butter. Add marshmallows and melt over medium heat, stirring continuously. As soon as marshmallows are fully melted, remove from heat. Add cereal and bacon mixture. Stir well, using a rubber scraper, until well incorporated.
Transfer mixture to baking pan, pressing with the flat side of the rubber scraper until the top is relatively level, without smashing cereal pieces. Allow bars to cool at room temperature for at least an hour. Don’t refrigerate; that will cause the bars to harden (they'll last about five days without refrigeration).
Cut into 9 squares. Wrap each bar in plastic wrap or parchment (if using parchment, bars should be kept in a sealed plastic container.