In a non-stick pan, add olive oil and 2 tbsp butter over medium-high heat. Once butter is melted, add chicken in a single layer. Cook 4 minutes on each side until brown. Transfer to plate. Cook in batches if pan is not large enough.
Cool pan by reducing heat to medium-low. Add garlic, cook until brown (1 minute). Stir in crushed tomatoes and cayenne, loosening brown buts in pan. Add 2 tbsp of butter, increase heat to a simmer. Add salt and pepper stirring occasionally. Simmer 5 minutes until thick.
Reduce pan heat to barely a simmer, placing chicken in pan. Top with Italian seasoning, cooking several minutes until sauce is absorbed some.