Heat the oil in a large skillet or wide-bottomed pot over medium-high heat.
Add the onion and cook for 5 minutes or until translucent.
Add the garlic and chopped tomatoes.
Cook for another 5 minutes, stirring occasionally, until the tomatoes begin to break down.
Stir in the Gardein Chick'n Scallopini, vegetable stock, arborio rice, artichoke hearts, basil, pepper, and saffron.
Bring the mixture to a simmer.
Reduce the heat to medium-low and let it simmer for 10 minutes, stirring occasionally to prevent the rice from sticking.
Continue to cook for 10 more minutes *without stirring*. This step is crucial for developing the delicious, crispy rice layer at the bottom called the socarrat.
Turn off the heat. Scatter the spinach leaves over the top, cover the pan, and let it rest for 5 minutes. The steam will wilt the spinach perfectly.
Gently stir the wilted spinach into the paella.
Squeeze fresh lemon juice over the top just before serving.