Cut large Brussel sprouts in 1/2 lengthwise and then slice into very thin shaved strips. Place shaved Brussel sprouts in large mixing bowl. Alternately use slicing blade of food processor and place brussel sprouts through feeding tube to slice.
Wash apples and cut into 1/4's, remove core and seeds. Slice apples very thinly width wise. Don't peel off the skins. Add to bowl with brussels spouts. Add cranberries and 1/2 of toasted pumpkin seeds reserving remaining for top.
In a small bowl whisk together dijon mustard, lemon juice, lemon zest. Slowly whisk in olive oil to emulsify and combine. Add maple syrup, salt and pepper. Taste and adjust seasonings as needed.
If you are serving salad right away pour all of dressing over salad and toss gently to combine. If you are making this in advance, pour half of dressing over salad and reserve remaining 1/2 to toss in right before serving.
Top salad with remaining toasted pumpkin seeds, serve as is or on a bed of salad greens or spouts.
Add crumbled feta cheese or slivered parmesan on top if desired.