Step 1: Prepare the Bread

1. Cut the bread into 1-inch cubes. Spread the cubes on a baking sheet and toast them in a preheated oven at 350°F for 5–7 minutes. This step ensures the bread won’t become soggy as it absorbs the custard.

Step 2: Cook the Sausage

1. In a skillet over medium heat, cook the sausage, breaking it into small pieces. Once browned and fully cooked, remove it from the skillet and set aside.

Step 3: Sauté the Vegetables

1. Using the same skillet, add the sliced mushrooms and sauté for 3–4 minutes until softened. Add the chopped green onions and cook for another minute.

Step 4: Make the Custard

1. In a large mixing bowl, whisk together the eggs, milk, kosher salt, paprika, and a dash of black pepper. Whisk until smooth and well-combined.

Step 5: Assemble the Strata

1. Grease a 9×13-inch baking dish with cooking spray or butter.
2. Spread the toasted bread cubes evenly across the dish.
3. Sprinkle the cooked sausage and mushroom mixture over the bread.
4. Evenly distribute the shredded cheddar cheese over the top.
5. Pour the egg custard mixture over everything, ensuring the bread is fully coated.

Step 6: Chill and Bake

1. Cover the dish with plastic wrap and refrigerate for at least 1 hour or overnight.
2. Preheat the oven to 375°F. Remove the plastic wrap and sprinkle grated Parmesan cheese on top.
3. Bake the strata uncovered for 40–45 minutes or until the top is golden brown and the center is set.

Step 7: Serve and Enjoy

1. Allow the strata to cool for 5–10 minutes before slicing. Serve warm, garnished with additional green onions if desired.