1. Stir together the nut butter and liquid sweetener in a heated saucepan on the stove.
2. When blended, take off from heat and add vanilla and nuts/seeds. Then, carefully fold in puffed cereal.
3. Lightly grease a pan or shallow plastic container (I used one of those huge margarine tubs).
4. Plunk the cereal mixture into the pan/container and pat down evenly. Store in the fridge to cool quickly, or leave out on the counter to firm.
Cut into squares and munch away!