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Grease a 9x13 baking dish with cooking spray. Spread hash browns in the prepared baking dish.
Cook sausage over medium heat in a large skillet until starting to brown, about 2 minutes.
Add bell peppers, onion, garlic, and oregano to skillet. Continue cooking until vegetables are tender and sausage is no longer pink, about 5 minutes. Add spinach; cook until wilted, about 1 minute.
Spread vegetable and sausage mixture over hash browns in the baking dish. Sprinkle cheese over the top.
Beat eggs, milk, mustard, salt, and pepper together in a bowl. Pour egg mixture over casserole. Cover and refrigerate 8 hours to overnight.
Preheat the oven to 325 degrees F (165 degrees C).
Bake casserole, uncovered, in the preheated oven until a knife inserted in the center comes out clean, 50 to 60 minutes. Let stand 10 minutes before serving.