Wash and pat dry the chicken breast fillets with paper towels. Season with salt and pepper. Arrange 5 bacon slices per fillet on the work surface and wrap the chicken in the bacon.
Heat olive oil in a large pan over medium-high heat. Add the crushed garlic cloves and rosemary sprigs. Fry the bacon-wrapped chicken fillets on all sides for 4 minutes.
Preheat the oven to 160°C (320°F).
Transfer the fillets to the oven and bake for 10–12 minutes until the internal temperature reaches 74°C (165°F).