1-First Step: Prepare Meatloaf Mixture Grate half an onion over the breadcrumbs in a large bowl and let it soak a few minutes to soften breadcrumbs and add moisture. Add ground beef, minced garlic, egg, ketchup, crumbled beef bouillon, Worcestershire sauce, Dijon mustard, salt, and pepper. Gently mix by hand until just combined to avoid tough patties.

2-Second Step: Shape and Sear Patties Form the mixture into 4 to 5 firm, oval-shaped patties about 3/4 inch thick. Heat olive oil in a skillet over medium-high heat. Sear patties quickly for about 1-3 minutes per side until browned but slightly undercooked inside. Remove patties and set aside.

3-Third Step: Make Mushroom Gravy In the same skillet, add more olive oil if needed. Sauté chopped onions until translucent (2-3 minutes), add sliced mushrooms, and cook until golden (3-4 minutes). Add minced garlic and cook an additional 30 seconds. Melt butter over medium heat, sprinkle in flour, and stir constantly for 30 seconds to form a roux.

4-Fourth Step: Combine and Thicken Gravy Gradually whisk in beef broth and water, stirring continuously to prevent lumps. Add Dijon mustard, Worcestershire sauce, salt, and pepper. Simmer until gravy thickens, adjusting thickness by adding water if necessary.

5-Final Step: Cook Patties in Gravy and Serve Return patties with any juices to the skillet, spoon gravy over, partially cover, and simmer on low heat for 5-7 minutes until patties are fully cooked and gravy is smooth. Remove from heat, garnish with fresh parsley, and serve hot over mashed potatoes or preferred sides.