Portabella Basil Sub

Step 1
Melt butter in a skillet with a lid over medium heat. Add shallots, basil, and garlic; cook and stir until fragrant, about 1 minute. Stir in paprika and black pepper; season with salt. Add spinach, mushrooms, and bell pepper, stir a few times, cover with lid, and reduce the heat to medium-low. Cook until spinach and mushrooms give up their liquid and peppers are softened, about 4 minutes.

Step 2
Uncover the skillet. Add pepper sauce and balsamic vinegar. Increase the heat to medium, and let mixture cook down and thicken slightly, about 2 minutes.

Step 3
Spoon hot mushroom mixture onto split hoagie roll. Serve immediately.