Cut bread into cubes. Place on a baking sheet and bake at 225° F for 15 minutes. Turn cubes over and continue baking 15 minutes or until dry and crisp.
Dice onion, mushrooms and bell peppers.
Melt margarine in a small skillet and sauté onion, mushrooms and red peppers.
Grease a 9” square baking dish with nonstick cooking spray. Arrange half of the bread cubes in a single layer in the dish and sprinkle with half of the vegetable mixture. Arrange spinach leaves on top.
Form a second layer with remaining bread and vegetables on top.
Whisk together eggs, vinegar, half & half creamer, Worcestershire sauce, hot sauce and black pepper. Pour evenly over the bread.
Cover surface with plastic wrap and refrigerate at least 1 hour or overnight.
Allow strata to stand at room temperature for 20 minutes.
Pre-heat oven to 325° F. Remove plastic wrap and bake 50 minutes.
Remove from oven and sprinkle cheddar cheese over the top. Cook fo an additional 10 minutes or until a knife inserted near the center comes out clean. Cut into 9 servings and serve hot.