These bars as good as, if not better than, any energy bar you can buy in a health food store. Top with chocolate chips or shredded coconut for a candy bar effect.
In a stand mixer, blend the eggs, vanilla, stevia or agave, vanilla, banana, and milk together until well blended.
In a separate bowl, whisk together remaining ingredients. Mix wet and dry together. Press mixture into slow cooker that has been lined with parchment paper, allowing extra to come up the sides. Cook on low for 8 hours. When done cooking, lift out of the slow cooker using the parchment paper. Cut into bars and top with dried fruit, nuts, or shredded coconut if desired.