Add the frozen berries, peanut butter, jam, milk, and sweetener into the blender.
Secure the lid and blend on high for about 30-45 seconds, stopping to scrape down the sides with a spatula if needed. The mixture should start to look thick, smooth, and vibrant in color.
Continue blending until the mixture is glossy, thick, and completely smooth — it should hold a slight jiggle when gently shaken, with no lumps remaining.
Pour the thick, creamy mixture into a bowl. The surface should be shiny and slightly domed, ready for toppings.
Top the bowl with your favorite toppings—sliced bananas, granola, additional dollops of jelly, or a sprinkle of chia seeds for extra crunch and flavor.
Serve immediately with a spoon and enjoy this nostalgic, nourishing treat that feels like dessert but fuels your morning.