Mini Baked Frittata with Garlicky Sautéed Tomatoes & Spinach, Fresh Basil, and Feta

olive oil 5-6 cherry tomatoes, halved 1/3 cup of baby spinach, stems removed Sea salt and freshly cracked pepper, to taste 1 clove of garlic, minced 2 eggs, whisked 1 tbsp mik 1 tbsp fresh basil 1 tbsp feta cheese