Crockpot Tomato Basil Soup

I picked up more hours this fall which means I am not home until at least 3:30pm most days.  With dinner between 5 & 5:30pm, I really need to "keep it simple" this year.  Because of my limited prep time, my crockpot is getting a workout this year!  A coworker pinned this recipe and brought in her leftovers for lunch.  She let me snitch a spoonful.  It was delicious, so I made it later that week.  Although my kids didn't really like it, my husband & I did.

NOTE: This recipe has about 45 minutes of work at the end to finish it, so prepare accordingly.

• 2 (14-ounce each) cans petite diced tomatoes, undrained (I used the garlic & olive oil variety)
• 1 cup finely diced celery (I omitted this)
• 1 cup finely diced carrots (I used matchstick carrots)
• 1 cup finely diced onions
• 1 teaspoon dried oregano
• 1 tablespoon dried basil
• 4 cups low-sodium chicken broth
• 1 bay leaf
• 1/4 (4 tablespoons) butter
• 1/2 cup flour
• 1 cup freshly grated Parmesan cheese
• 2 cups half-and-half
• 1 teaspoon salt
• 1/2 teaspoon black pepper 

• In crockpot, combine the tomatoes, celery, carrots, onions, oregano, basil, broth, and bay leaf. Cover and cook on low for 5-7 hours until the vegetables are tender.
• About 45 minutes before serving, melt the butter over low heat in a medium saucepan. Add the flour and cook, stirring constantly, until the mixture is golden, about 3 minutes. 
• Whisking constantly, slowly ladle in 1 cup of the hot soup from the slow cooker. Whisk until smooth and bubbly. Add another cup and stir again until smooth. Add another cup or two and stir until smooth.
• Stir the creamy, hot mixture back into the slow cooker. Add the Parmesan cheese, half-and-half, salt and pepper, adding more salt and pepper if needed.
• Cover and cook on low for 30 minutes until ready to serve. Top with croutons.