Preheat oven to 350°. In a large bowl, combine oats, brown sugar, peanuts, chocolate chips and sunflower kernels. Stir in butter, honey and vanilla until combined (mixture will be crumbly). Press into a greased parchment-lined 15x10x1-in. baking pan., Bake until lightly browned, 15-20 minutes. Cool 15 minutes in pan on a wire rack; cut into bars. Cool completely before removing from pan. Freeze option: Transfer cooled bars to an airtight container. To use, thaw bars at room temperature.