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Heat oil in large saucepan on medium heat. Add onions and celery; cook and stir 3 minutes. Add kielbasa; cook and stir 3 minutes longer or until kielbasa is lightly browned and vegetables are softened. Stir in thyme, garlic powder, paprika and red pepper; cook and stir 2 minutes or until fragrant.
Stir in broth, tomatoes and lentils. Bring to boil. Reduce heat to low; cover and simmer 15 minutes or until lentils are tender.
Stir in spinach. Simmer until wilted. Ladle into soup bowls to serve.