If your rig has a microwave, it is likely a convection microwave, which has both the microwave and a conventional heating element and will function as a conventional oven too. I love biscuits ‘n’ gravy for breakfast, too. I buy a bag of frozen biscuits, and make them as I need them in the convection microwave in our RV. The bag calls for 20 minutes at 400, but rather than preheating the oven, I just throw the frozen pucks in and set the oven for 24 minutes. Perfect biscuits every time.