Cover Steak (4) with a piece of plastic. Using the flat side of a mallet, pound meat out until thin. Using the meat tenderizer side of a mallet, pound both sides.
Into one mixing bowl, add Milk (1 cup) and beaten Egg (2). Beat together.
Into a second mixing bowl, add All-Purpose Flour (1 1/2 cup), Salt (1 teaspoon), Onion Powder (2 teaspoon), Paprika (2 teaspoon), and Ground Black Pepper (3/4 teaspoon). Whisk to combine.
Coat each steak in the dry ingredients, then place them onto a baking tray lined with a wire rack.
Coat each steak in the wet ingredients, then dredge once more in the dry ingredients. Return to the baking tray.
Add Canola Oil (as needed) to a pan. Once hot, add the steaks. Cook for 3-4 minutes on each side, or until golden brown. Remove to a wire rack to drain.
Into a skillet over medium heat, add Butter (5 tablespoon). Once melted and bubbling, add sliced Onion (1) and Baby Bella Mushroom (1/2 cup). Cook for 1-2 minutes.
Reduce heat to medium-low. Add All-Purpose Flour (1/4 cup), half at a time, stirring constantly to incorporate.
Add Milk (1 1/2 cup) and Chicken Stock (1/2 cup). Bring to a boil, whisking frequently. Taste and add Salt and Pepper (to taste) and Crushed Red Pepper Flakes (to taste).
Pour gravy over the chicken fried steak before serving.