Heat the olive oil in a skillet over medium heat. Add the minced garlic and cook briefly until fragrant, about 30 seconds. Add the sliced mushrooms and sauté until they soften and release their moisture, stirring occasionally, until tender and lightly golden.
Cook the shrimp
Add the shrimp to the skillet along with the dried thyme, salt, and pepper. Cook for just a few minutes, stirring gently, until the shrimp turn pink and opaque. Avoid overcooking, as they will finish cooking in the oven.
Make it creamy
Pour in the heavy cream and stir to combine. Add half of the shredded cheddar cheese, stirring until melted and evenly incorporated. The mixture should be creamy and well coated.
Assemble the casserole
Transfer the shrimp and mushroom mixture into the prepared casserole dish, spreading it out evenly so every serving gets a good balance of shrimp and sauce.
Add the cheesy bread crust
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