To make the berry base, heat a medium-size skillet greased with butter or ghee over medium-high heat. Add the berries and cook for 3-5 minutes or until softened. Add sweetener if necessary.
Place almonds and pecans into a food processor. Add the butter, cinnamon, vanilla extract, sea salt and stevia (if using). Pulse for a few seconds until the mixture is chopped as roughly or as finely as you like.
Sprinkle the nut mixture on top of the berries and broil for about 7-10 minutes, until lightly browned and crisp on top.
Transfer to a cooling rack and let cool for 5-10 minutes. Serve warm or cold with a dollop of whole milk yogurt on top and a sprinkle of cinnamon.