Heat olive oil in a large skillet over medium heat and add the minced garlic and chopped onion. Cook for 4-5 minutes until they turn golden and smell intensely fragrant—this is the moment everything changes. I always smell this moment first because it tells me the oil is doing its job of pulling out the sweet notes.

Add the fresh spinach to the same skillet with the garlic and onion mixture. Stir constantly for 2 minutes until the spinach completely wilts down and releases its liquid. The reason this matters is that any moisture left in the spinach will water down your dip later, so squeeze it mentally as it cooks.

In a separate bowl, cut the cream cheese into chunks and stir in the heavy cream until combined but still slightly lumpy—that's normal and actually preferred. The lumps dissolve during cooking, but starting smooth means the dip breaks apart. Pour this mixture into your baking dish and fold in the wilted spinach mixture gently.

Add the drained artichoke hearts to the cream cheese base along with the shredded mozzarella and grated Parmesan. Season with salt, pepper, and lemon juice, then stir until every ingredient is distributed evenly. The lemon juice binds everything visually, meaning you'll see yellow streaks mixing in—keep stirring until the color feels uniform.

Transfer everything to a baking dish and smooth the top with the back of a spoon. Bake at 375°F for 35 minutes until the edges bubble and the center jiggles slightly when you shake the dish. That jiggle means it's still creamy inside, not overcooked into a rubber consistency.

Let the dip rest for 5 minutes before serving so it sets enough to hold shape on a chip or cracker. I learned this the hard way—serving it straight from the oven means it slides off everything and pools at the bottom of your serving dish like soup.