In a small saucepan, combine the mixed berries, water, and lemon juice over medium heat.
Simmer the berry mixture for 8-10 minutes, mashing slightly with a fork, until it becomes a thick and bubbling compote.
In a large mixing bowl, whisk together the spelt flour, baking powder, and sea salt.
In a separate bowl, stir the non-fat Greek yogurt, egg whites, and vanilla extract until the mixture is smooth.
Gently fold the wet ingredients into the dry ingredients until just combined, being careful not to overmix the batter.
Heat the coconut oil in a large non-stick skillet over medium-low heat.
Pour 0.25 cup portions of batter onto the skillet and cook until small bubbles form on the surface, then flip and cook until golden brown.
Serve the warm pancakes stacked high and smothered with the fresh berry compote.