Peel butternut squash and, using vegetable peeler, create long thin ribbons of squash. Place ribbons in large bowl with red grapes and red onion; toss in olive oil and spices.
Place flatbread on parchment paper-lined baking sheet and top with grape and squash mixture. Scatter crumbled goat cheese on top. Bake for 12 minutes.
Toss arugula in lemon juice and place loosely on top of flatbread.
Recipe Notes
Per serving: 219 calories; 7 g protein; 7 g total fat (1 g sat. fat); 33 g total carbohydrates (6 g sugars, 5 g fiber); 355 mg sodium