Roast Veggie Sandwich with Basil Sauce

For the Basil Sauce:

• 1 cup basil fresh leaves
• 2 tablespoons pine nuts or almonds
• 1 clove garlic
• 1/2 lemon juiced
• 1 pinch salt
• 1/4 cup olive oil
• 3 tablespoons Parmesan Cheese grated
• 2-3 tablespoons Greek yogurt any fat concentration, or Skyr

For the Roast Veggies:

• 3 cups mushrooms sweet bell peppers, zucchini, carrots, onions and tomatoes, chopped mixed veggies, such as mushrooms
• 1 teaspoon each of salt and pepper
• 2 teaspoons oregano dried
• 1 pinch red pepper flakes
• 1 tablespoon olive oil

Assembling the sandwiches:

• 4 ciabatta bread or baguette sandwich breads
• 1 cup spinach fresh, baby leaves
• Parmesan Cheese extra, for sprinkling