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For million dollar soup, beans, vegetables, and sausage are easily accessible and relatively inexpensive ingredients, but the final result is something that feels deeply special.
Prepare oven and baking sheet: Heat oven to 350°F and line a baking sheet with aluminum foil.
Roast squash and sausage: In a medium bowl, toss together squash, sausage, 1/2 teaspoon. salt and 1/2 teaspoon pepper, and 2 sprigs of thyme. Spread onto prepared baking sheet. Roast until squash is softened and sausage has begun to brown, 25 minutes.
Cook bacon: Meanwhile, add cut bacon to the bottom of a cold Dutch oven or large 4 quart soup pot. Heat to medium and cook bacon until crisp, 5-7 minutes, stirring frequently.
Remove bacon from pan: Remove bacon with a slotted spoon, reserving fat in pan.
Cook garlic, onion, and celery: Add butter to pot, swirling to combine. Add onion, garlic, and celery and cook 2-3 minutes until fragrant.
Make roux: Add flour to create a light roux, stirring constantly. When mixture has thickened, add white wine, stir and cook for 1 minute.
Add stock: Add stock, remaining salt and pepper, thyme sprigs and beans. Bring to a boil and reduce to a simmer for 10 minutes.
Blend some of the soup mixture: Remove 3 cups from mixture and transfer to a blender. Secure lid on blender, and remove center piece to allow steam to escape. Blend until smooth and stir blended mixture back into soup pot. Return to a simmer. Stir in heavy cream and lemon zest.
Stir in squash and kale: Add cooked butternut squash mixture and torn kale to pot, and cook until kale is bright green and lightly wilted, 3-5 minutes.
Garnish and serve: Top individual servings with extra thyme leaves and bacon.