Heat the olive oil on medium-high heat in a large skillet. Add sliced onions and cook for about 10 minutes, constantly stirring
Reduce heat to medium and continue cooking the onions for 10 more minutes, continuing to stir, as onions brown even more without burning. Add a pinch of salt over the onions
Continue cooking for 10 more minutes on medium or low heat, stirring occasionally to make sure onions don’t burn stick to the bottom of the pan
Remove the onions from the skillet onto a plate.
Creamy Sauce
Add the plant milk and vegan butter to a bowl and mix well using a whisk or immersion blender, set aside
Heat the olive oil on medium heat. Add sliced mushrooms and sprinkle with a pinch of salt. Cook mushrooms for about 5 minutes, occasionally stirring, until mushrooms are soft
Add fresh spinach to the skillet and stir on low heat just until spinach starts to wilt
Add back the caramelized onions
Add plant milk mixture and salt to the mushroom and spinach mixture and bring to a quick boil. Immediately reduce to simmer. Keep stirring while the sauce simmers for a couple of minutes
Tortellini
Cook tortellini according to package instructions.
Add tortellini to the creamy sauce. Stir on low heat for a couple of minutes to reheat.
Top with fresh cracked black pepper and grated vegan parmesan when serving.