Begin by patting the sirloin or ribeye steak cubes dry with paper towels. Season generously with salt and pepper.

In a large skillet, heat olive oil over medium-high heat until shimmering. Add the seasoned steak cubes and cook each batch until golden-brown, about 2-3 minutes.

Reduce the skillet heat to medium and add unsalted butter. Melt the butter and add the minced garlic, sautéing for about 30 seconds.

Return the seared steak bites to the skillet, tossing gently to coat in the garlic butter for about 1-2 minutes.

In a separate saucepan, melt butter and sauté additional minced garlic. Stir in heavy cream and bring to a gentle simmer.

Gradually whisk in the Parmesan cheese until the sauce is smooth and creamy, about 2-3 minutes.

Serve by drizzling the creamy sauce over steak bites or on the side for dipping, garnished with parsley.