01 -
Thinly slice onions and heat 2 tablespoons olive oil in large skillet over medium-high heat.
02 -
Cook onions on high for 10 minutes, stirring constantly to prevent burning.
03 -
Reduce heat to medium and continue cooking onions 10 more minutes, stirring frequently.
04 -
Add pinch of salt and cook onions 10 additional minutes on medium-low until deeply caramelized.
05 -
Remove caramelized onions from pan and set aside.
06 -
Heat remaining tablespoon oil and add sliced mushrooms with pinch of salt.
07 -
Cook mushrooms about 5 minutes until softened, stirring occasionally.
08 -
Add fresh spinach and stir until just beginning to wilt.
09 -
Return caramelized onions to pan with vegetables.
10 -
Pour in heavy cream and 1/4 teaspoon salt, bringing just to boil then reducing to simmer.
11 -
Meanwhile, cook tortellini according to package directions until al dente.
12 -
Add drained tortellini to cream sauce, stirring gently to combine.
13 -
Simmer additional 2-3 minutes until sauce thickens slightly.
14 -
Season with black pepper before serving hot.
15 -
Garnish with additional pepper if desired.