Line an 8 x 8 inch baking pan or dish with parchment paper and set aside.
Combine sunflower butter, honey, vanilla and salt in a microwave safe bowl. Heat gently to soften. Stir until smoothly blended.
Transfer to a larger bowl and add 3 cups cereal. Combine thoroughly to coat all the cereal. Include any extras you like such as chocolate chips, raisins, or nuts and combine evenly.
Press cereal mixture into the prepared 8 x 8 inch pan. Place in refrigerator for 1 hour to firm.
Cut into squares once firm. Keep refrigerated for best texture.