Preheat the oven to 350 degrees F and ready a 9x11 glass baking dish.

Coat the bottom of the dish with vegetable oil. Bake the chicken thighs for 30 minutes uncovered. This time may need to be adjusted downward if the chicken is cooking too quickly.

In a small bowl or measuring cup, mix the mustard, maple syrup, thyme, salt, and pepper. Brush or pour the glaze over the chicken and bake for another 15 minutes, or until the internal temperature reads at least 170 degrees.