Season pork evenly with onion powder, salt, and pepper.
In a large, 12-inch skillet, heat olive oil over medium heat. When the oil is hot, add pork and sear for 3-5 minutes on all sides until cooked through (about 13-15 minutes total). Pork is cooked through when it reaches an internal temperature of 145°F.
Remove the pork from the skillet and set it on a plate. Tent it to keep the pork warm.
In the same skillet, melt butter. Add garlic and cook for 1 minute. Whisk in flour until slightly thickened.
Add in chicken broth, heavy cream, parmesan cheese, lemon juice, salt, and pepper.
Let the sauce simmer for 5-8 minutes, or until thickened.
Add pork bites back to the pan and toss them in the sauce to coat. Serve immediately.