You can always add salt to enhance the flavor of the peanuts. A tablespoon of honey or pure maple syrup will give it some sweetness without the need for brown sugar, powdered sugar or artificial liquid sweetener. For best results, I like to add 1/2 teaspoon of vanilla powder or vanilla extract. A pinch of cayenne pepper for spicy peanut butter, or 1/4 cup cocoa powder and fold in some chocolate chips for chocolate peanut butter. Just make sure to blend the flavors in at the end of processing.