Bring a large pot of water to a boil and be sure to season the water well with salt. Cook the brown rice penne pasta until al dente, about 12-15 minutes. Drain, and set aside.
On medium heat, add 2 tbsp of olive oil to the pan, then add 3 cloves of minced garlic, and the sliced mushrooms and begin to cook down. After a couple of minutes, season with kosher salt and black pepper, and fresh minced thyme
Once the mushrooms are cooked and tender, add the fresh lemon juice and a little more salt so the mushrooms are tangy, rich in garlic flavor, and seasoned nicely. Simmer for a moment and then turn off the heat. Reserve the mushrooms for when you’re ready to layer the mac & cheese in the casserole dish.
To make your cheese sauce, bring a saucepan to medium heat and add olive oil and 2 cloves of minced garlic, and cook for a moment, then add your yogurt to the pan, and turn the heat to low.
To the yogurt, slowly whisk in the shredded mozzarella cheese, adding a bit of milk to thin out the sauce. Keep the temperature on low, do not allow to boil. Season the cheese sauce with salt, pepper, garlic powder, and nutmeg
Stir to combine and remove from the heat so that the yogurt does not curdle, then add the cooked pasta to the mixture
Turn oven on to broil
In a casserole dish, drizzle and coat the bottom with extra virgin olive oil
Begin layering the penne and cheese pasta on the bottom, then a layer of mushrooms on top, and then another layer of pasta, another layer of mushrooms, then pasta, then mushrooms one more time.
Broil in the oven for 5-6 minutes, and serve!