White Pesto Lasagna

Bahan-bahan (8 porsi)

• 2 tablespoons extra virgin olive oil
• 4 tablespoons salted butter
• 1 shallot, chopped
• 3 cloves garlic, smashed
• 2 teaspoons dried thyme
• 1 teaspoon dried rosemary
• kosher salt and black pepper
• 1/4 cup all-purpose flour
• 2 cups whole milk
• 2 cups vegetable broth
• 2 cups shredded provolone
• 1 cup grated parmesan cheese
• 1 1/2 cup basil pesto
• 2 package s (10 ounces) frozen spinach, thawed and drained
• 1 box no-boil lasagna noodles