Yes to both! Follow instructions in the recipe card to grill with the grill pan, using high heat, but make sure to coat the pan with a little cooking spray before adding the thighs. Note that the cooking time will vary on an indoor grill pan, and will take about 2 additional minutes per side. This recipe can also be made in the oven under the broiler in the upper third of the oven. Place the thighs on a broiler pan and broil until browned on one side, about 5 minutes. Flip them and broil them until they reach an internal temperature of 165 degrees F. Check the thickest part of the meat with a digital meat thermometer to see if they are cooked through. Keep an eye on them, and rotate the pan to ensure that they cook evenly. Timing will vary depending on how thick the thighs are and how close the pan is to the broiler.