Add cashew butter, honey, and coconut oil to a microwave-safe bowl and heat briefly until smooth and melted

Stir in vanilla extract, salt, and nutmeg until the mixture is glossy and well combined

Pour the warm mixture over the oats in a large bowl, stirring until every piece is coated

Fold in dried blueberries, chopped cashews, pumpkin seeds, chia seeds, and lemon zest

Mix thoroughly until the texture becomes thick, sticky, and evenly distributed

Transfer the mixture into the prepared pan and spread it out evenly

Press firmly using the bottom of a glass until compact and level with no loose edges

Place the pan in the freezer until the mixture feels firm to the touch

Lift out using parchment paper and slice into evenly sized bars