In a large pot, heat the olive oil over medium-high heat. Add the onion, carrot, and celery and cook until soften, about 5 minutes. Add in the garlic, tomato paste, and bay leaves. Stir until the tomato paste is mixed in.
Add the tomatoes, roasted red peppers, vegetable broth, sugar, dried thyme, and crushed red pepper. Stir to combine. Reduce to low and simmer for 15 minutes.
Stir in the almond milk and basil. Remove the bay leaves. Turn off the heat and use a hand blender to purée the soup in the pot. If you don't have a hand blender, let the soup cool until warm and transfer to stand blender. Blend until smooth and return to the pot. Heat over medium heat until heated through.
Ladle the soup into bowls and garnish with fresh basil and croutons, if desired.
Note-this soup will keep in the refrigerator for up to 5 days. It also freezes well. To freeze, cool the soup completely and store in a freezer container for up to 2 months.