Preheat the oven to 350 degrees Fahrenheit and spray a 9 x 13-inch or 3-quart baking dish with nonstick cooking spray and set aside.
Cook and crumble 1 pound breakfast sausage in a large skillet over medium-high heat until thoroughly browned and no pink remains, about 7 minutes. Drain off any grease.
Cut 1 (16.3-ounce) tube Grand's canned biscuits into quarters, then add them to the baking dish and top with the cooked sausage.
Add 2 cups shredded cheddar cheese evenly over the top of the sausage and biscuits.
Whisk together 6 large eggs and 1 cup milk in a medium bowl, then pour evenly over the top.
Cover with aluminum foil and bake for 45-50 minutes, until the eggs are set. Remove the foil and bake for 5 minutes or so, until lightly browned on top. Let the casserole sit for 5-10 minutes before serving.
Notes
Storage & Reheating Instructions• Storage: Cool completely, then refrigerate in an airtight container for 3 to 4 days. • Reheating: Microwave individual portions for 1 to 2 minutes, or warm the full dish in a 350°F oven until heated through.