Line an 8x8 (20x20 cm) baking pan with a sheet of aluminum foil or parchment paper, leaving a few inches of overhang on the sides to allow for easy removal. Generously spray the foil with cooking spray and set aside.Add brown rice syrup, sunflower seed butter, and coconut oil to a microwave-safe bowl and nuke on high until ingredients are fully melted and combined, about 1 minute. Remove from microwave and allow to cool and thicken.Combine remaining ingredients in a large mixing bowl, stirring until evenly distributed. Pour wet ingredients into dry ingredients and mix until fully incorporated.Transfer mixture to prepared pan and use a spatula or your hands to spread it evenly, making sure to press down firmly. Cover pan with a sheet of foil and place into the fridge to set, at least 2 hours but preferably overnight. When bars have set, remove from pan using the foil overhang, and use a sharp knife to cut into individual bars. Store bars in the fridge or freezer for best results.