Preheat the oven to 350 degrees F. Place the bacon onto a large piece of parchment paper. Weave the bacon. Under, over, under, over to make it look like a checker board. Lift the parchment with the square of weaved bacon into a 9 by 5 inch meatloaf pan.
Place the beef, powdered pork rinds, diced mushrooms, onion, egg, salt, mustard and pepper into a large bowl. Use your hands to combine well. Place the mixture into the bacon weave in the pan. Fold the bacon in a weave over the meatloaf mixture. Pull the meatloaf out of the pan and place it on a wire rack over a baking sheet with edges (to catch the baking grease).
Place it in the oven to cook for 45 to 55 minutes or until bacon is crisp on the outside and meatloaf is cooked through.
Remove from oven and allow to rest for 15 minutes before slicing.
Store extras in an airtight container in the refrigerator for up to 3 days. Reheat in a baking dish in a preheated 350°F oven for a few minutes or until warmed through