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1. Melt butter in large pot over medium heat. Add onion and cook for 2-3 minutes. Add garlic and cook for an additional 1 minute. Stir in celery, carrots, and oregano. Cook for 2-3 minutes. Season with salt and pepper.
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2. Stir in chicken broth and bring to boil. Reduce heat and simmer for 10 minutes.
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3. Add rice and cook for 8 minutes. Stir in chicken breast and cook for an additional 2 minutes. Remove from heat and stir in lemon juice. Top with lemon slices before serving.