Heat oil in deep non-stick pan, medium high heat
When hot, add sausage. Fry until browning/crisping
Remove sausage with slotted spoon, leaving fat in pan
Add onions to pan
Fry until starting to become translucent, then add garlic and herbs
Fry a few more minutes until garlic and herbs are fragrant
Spread the onions out, leaving some gaps to put in chicken
Add chicken and season with pepper and another few dashes of Rosemary
Fry for 5 minutes, flipping once (2.5 minutes per side) until onions are caramelizing and chicken has browned slightly
Remove chicken, setting aside on a plate
When the pan is hot again, add white wine
Let bubble several minutes and reduce slightly
Lower the heat to medium, return sausage to pan, add tomatoes, tomato paste, and a splash of water
Cover and simmer for 15 minutes until sauce has thickened and reduced slightly
Return chicken to pan, cover with sauce, simmer 15 more minutes uncovered
Serve alone, with light pasta, or rice