Add remaining ingredients to blender or food processor, add melted coconut oil and blend or process until smooth.
Pour into an 8x8 baking pan (Other sizes can work as well; larger pans will yield a thinner fudge.) and freeze until solid. To make clean up easier, you can even shape the fudge "free form" on a baking sheet into whatever shape and thickness you like. You can also use molds or an ice cube tray if you prefer.
Chill to set.
Store in refrigerator or freezer to prevent softening.
Notes
Sweetener: Any healthy sweetener, liquid or granulated, will work, but the sweetener amount in the recipe is for a 1:1 substitute for sugar. If you use something that isn't a direct substitution, you'll have to make adjustments. Honey and maple syrup are sweeter than sugar, so plan accordingly if you choose to use one of them. You may also substitute pure stevia extract or liquid stevia to taste. With stevia, start with a low amount and work your way up slowly, tasting after each addition. I recommend starting with 20 drops of liquid stevia or 4 scoops of stevia (see How to Use Stevia).
Blender: For owners of high-powered blenders like the Vitamix, there's no need to melt the coconut oil before blending. Simply place all ingredients in the blender and process until smooth. The blender version will have a lighter color and smoother texture.