This pizza is at an all-time savory level, with a hint of sweet with caramelized onions, sweet potatoes, thyme, lots of gruyere cheese, and a top of arugula and balsamic vinegar reduction!
Preheat oven to 450°F. Prepare homemade pizza crust according to the recipe, par-baking for 5 minutes. If using a pre-baked crust, prepare as directed.
In a large skillet, heat olive oil over low-medium heat. Add sliced onions and cook for 15-20 minutes, only occasionally stirring, as they become golden. Add 1 Tablespoon stock/water/wine to deglaze the pan and keep onions moist. Continue to cook for 10-15 minutes until onions are a deep golden. Remove from heat, set aside.
Mix together olive oil and minced garlic; brush across prepared pizza crust (I also brush some of the oil on the crust). Sprinkle thyme evenly across.
Layer sliced sweet potatoes across the pizza, leaving an edge for the crust. Spread caramelized onions across the sweet potatoes. Add gruyere cheese evenly on top.
Bake for 15-17 minutes until edges are golden brown and cheese is melted.
As pizza bakes, place balsamic vinegar in a small saucepan over medium heat. Bring to a low simmer for 10 minutes, until thick. Remove from heat.
Once the pizza is cooked, top with arugula and drizzle with balsamic reduction.
Notes
*Look for cheese specifically labeled vegetarian, if needed.