Pechuga de pollo a la toscana
boneless, skinless chicken breast steaks or halves • Salt and pepper, to taste • Olive oil, • butter (50 grams) • onion, thinly sliced • medium garlic cloves or 1 large, finely chopped or pressed • cherry tomatoes, halved (about 12 ounces or 350 grams) • baby spinach, stems removed (100 grams) • freshly grated Parmesan cheese (about 3/4 cup, 75 grams; avoid pre-grated imitation) • fresh basil or 1 tablespoon dried basil • heavy cream or whipping cream (about 240 ml) • lemon zest (preferably from a yellow lemon) •