In the same pan with the residual butter and garlic, add 2 more tablespoons of butter and the remaining minced garlic. Sauté until fragrant. Slowly whisk in the heavy cream and bring to a simmer, allowing it to reduce for 3-5 minutes.
Meanwhile, drain the potatoes and mash with melted butter, warm half-and-half, cheese, garlic powder, salt, and pepper until smooth.
Into the sauce, add red pepper flakes, green onions, and Parmesan cheese. Whisk until the sauce thickens. Adjust seasoning with salt and pepper as needed.
Serve by plating the steak bites over the cheesy mashed potatoes and spooning the Parmesan cream sauce over the top.
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