Corn, Spinach & Feta Salad with Orange-Mustard Vinaigrette

Ingredients

• 1/2 cup orange juice
• 2 tbsp extra-virgin olive oil
• 2 tsp Dijon mustard
• 1/4 tsp salt
• 6 cups fresh spinach leaves
• 2 cups halved, seedless red grapes
• 2 cups corn kernels
• 1 1/2 cups diced orange bell pepper
• 1/4 cup diced red onion
• 4 ounces crumbled feta cheese