2. While chicken is cooking, make sauce: In a medium saucepan, heat oil over medium. Add garlic; cook until fragrant, 1 minute. Add flour, cumin, and chipotles in adobo; cook, whisking, 1 minute. Whisk in broth and 1/2 cup water; bring to a boil. Reduce to a simmer, and cook, whisking occasionally, until sauce has thickened slightly, 5 to 8 minutes; season with salt and pepper. Transfer 1 cup sauce to bowl with chicken; toss to combine.