Marinated Grilled Chicken Croissant with Chipotle Mayo

Name: Marinated Grilled Chicken Croissant with Chipotle Mayo
Ingredients: FOR THE CHICKEN:; ¼ cups Red Wine Vinegar; ½ teaspoons Salt; 1 teaspoon Garlic Powder; 1 teaspoon Dried Oregano; 1 Tablespoon Honey; 2 whole Thin-cut Chicken Breasts, Or One Boneless Skinless Chicken Breast Cut Into 2 Thinner Pieces; 1 Tablespoon Butter; FOR THE CHIPOTLE MAYO:; ¼ cups Mayonnaise; 1 teaspoon Sriracha, Plus More To Taste; 1 whole Chipotle In Adobo Sauce, Finely Minced; FOR THE SANDWICHES:; 2 whole Croissants, Halved; 2 slices Cheese (any Kind You Like); Leaf Lettuce