Meanwhile, make the spinach mix: Heat the olive oil in a large skillet over medium-low heat. Add the garlic, stirring so it doesn't stick, and cook until fragrant. Stir in the spinach and season with salt and pepper, to taste. Raise the heat to medium-high and cook until the spinach is just heated through. Don't overcook or the spinach will discolor.
Once the rice has finished cooking, fold the spinach into the pot. Fluff the rice so that the spinach is evenly distributed. Taste and season with additional salt and pepper if necessary. If you like, add a couple of drizzles of olive oil to give the rice a little gloss.