• Preheat the oven to 350F (175C). Spray the inside of a 9x9 pan with cooking spray or grease with butter, then line it with a parchment paper sling, leaving excess on the two sides for easier removal. The spray will ensure none if the bars stick in any places the parchment paper is not covering.
• In a large microwave safe mixing bowl, combine the butter and peanut butter. Place in the microwave and melt in 30 second increments until the mixture is smooth. Add in the brown sweetener, egg and vanilla. Whisk until ingredients are fully combined.
• Stir in the almond flour, baking powder and salt. Mix until all ingredients are fully combined. The batter will be thick.
• Spread the peanut butter mixture into the prepared pan. Smooth to make an even layer. Place into already preheated oven and bake for about 17-20 minutes, or until golden brown. Let cool for 10 minutes.

Icing:

• While your peanut butter bars are cooling, make the icing. Combine the peanut butter, almond milk, and butter in a microwave-safe bowl. Microwave for 30 seconds or until the mixture is melted. Immediately add in your powdered sweetener and vanilla. Stir until fully combined.
• Pour over the baked peanut butter bars and spread into an even layer. Sprinkle with chopped peanuts and press them into the icing. Place into the refrigerator for about 1-2 hours, or until the peanut butter bars are firm. Use the sling to remove them from the pan and cut into 16 bars.