Preheat the oven to 400 degrees . Press the puff pastry into a 9-inch glass pie plate; trim the excess. Prick the bottom all over with a fork, line with parchment and fill with dried beans (or pie weights). Bake until golden, about 20 minutes. Remove the parchment and beans; transfer the pan to a rack to cool. Leave the oven on, but lower the temperature to 350 degrees .
Meanwhile, in a large skillet, heat 1 tbsp. EVOO over medium-high heat. Add the spinach and cook, tossing, until wilted, about 1 minute. Season lightly with salt, then drain in a colander. Add 1 tbsp. EVOO and the sausage to the skillet; cook over medium-high heat, breaking the meat up with a spoon, until golden brown and cooked through, 3 to 4 minutes.
Spread the sausage and spinach in the pie shell. In a large bowl, whisk together the eggs, ricotta and cream; pour into the shell. Bake until the eggs are set and the crust is golden, about 35 minutes.
Meanwhile, in a salad bowl, whisk together the remaining 2 tbsp. EVOO and the mustard; season with salt and pepper. Add the lettuce and toss. Serve with the quiche.