Preparation Steps

• Preheat your oven to 375°F (190°C). Lightly grease a 9x13 inch baking dish.
• In a large skillet, melt the butter over medium heat. Add the chopped onion and cook until softened, about 5-7 minutes.
  0.9 kg mushrooms
• Add the minced garlic and cook for another minute until fragrant.
  0.9 kg mushrooms
• Sprinkle the flour over the onion and garlic mixture, stirring constantly for 1-2 minutes to cook out the raw flour taste.
  0.9 kg mushrooms
• Gradually whisk in the milk until the sauce is smooth. Bring to a simmer, stirring frequently, until thickened.
  0.9 kg mushrooms
• Stir in 1 cup of the shredded cheddar cheese until melted and smooth. Season with salt and pepper.
  0.9 kg mushrooms
• Add the sliced mushrooms to the cheese sauce and stir to coat. Pour the mushroom mixture into the prepared baking dish.
  0.9 kg mushrooms
• Top with the remaining 0.5 cup of shredded cheddar cheese.
  0.9 kg mushrooms
• Bake for 20-25 minutes, or until bubbly and the top is golden brown.
• Let stand for a few minutes before serving.