Start by rinsing the sea scallops under cold water. Pat them dry with paper towels, and season both sides with kosher salt.
In a large skillet, heat the vegetable or canola oil over medium-high heat.
Carefully place the scallops in the hot skillet, making sure not to overcrowd the pan. Sear for about 2-3 minutes on one side, then flip and cook for an additional 1-2 minutes. Remove the scallops from the pan and set aside.
In the same skillet, lower the heat to medium and add salted butter. Once melted, add minced garlic and dried oregano, sautéing until fragrant (about 30 seconds).
Pour in the heavy whipping cream and milk, stirring to combine. Bring to a gentle simmer, allowing the sauce to thicken slightly.
Add the chopped spinach and sun-dried tomatoes to the sauce. Stir until the spinach wilts down.
Sprinkle in the freshly grated Parmesan cheese and stir until melted and creamy.
Gently place the seared scallops back into the sauce, allowing them to warm through for another minute.
Spoon the scallops and cream sauce over a bed of rice or couscous. Garnish with additional Parmesan or fresh herbs if desired.