Preheat the oven to 375°F.
Spray a 9-inch pie plate with nonstick cooking spray. Sprinkle the bread crumbs into the bottom of the pie plate.
In a large skillet, cook the crumbled turkey sausage and onions over medium-high heat, stirring occasionally, for about 7 minutes. Once the meat is no longer pink and the onions are translucent, transfer to a plate lined with paper towels to drain.
Add the sausage and onions to the pie plate, distributing evenly.
Sprinkle the pie plate with the green pepper, red pepper, and cheese.
In a medium bowl, whisk together the eggs, milk, and pepper, then pour into the pie plate.
Place in the oven and bake for 35 to 40 minutes or until the center is set and the top is beginning to brown in spots.
Remove from the oven and set the pie plate on a wire rack. Allow to cool for about 10 minutes before slicing into wedges.