In a large skillet over medium heat, brown the sausage with the onions. Add in the garlic when it’s almost completely cooked. Drain and return the meat to the skillet.

While the sausage is cooking, slice the loaf of bread in half horizontally, and tear out the soft bread in the middle. Rip it into small pieces and place it on a plate or a bowl, and set aside. Place the bottom half of the loaf on a baking sheet.

When the sausage is cooked through, add in the spinach and cook, stirring occasionally, until the spinach is wilted, about 1-2 minutes. Stir in the sauce and slow the meat mixture to heat through.

Add the torn bread bits to the meat mixture and stir it all together. Spread this mixture out evenly in the bottom half of the loaf/trough, evenly sprinkle the shredded cheese overtop, and then cap the sandwich off with the top half of the bread. Bake at 350 degrees for 10-15 minutes or until the cheese is melted. Remove the sandwich from the oven, and let it ‘rest’ for 5 minutes before slicing and serving, so that the meat and cheese ‘set’ and don’t just ooze on out.