01 -
Preheat oven to 375°F and spray a 9-inch pie plate with cooking spray. Gently press the pie crust into the plate, allowing it to rise slightly on the sides. Set aside.
02 -
Heat avocado oil in a large skillet over medium-high heat. Add crumbled sausage and cook for 5-7 minutes, breaking into small pieces until golden brown and cooked through. Remove sausage and leave 1 tablespoon of rendered fat in the pan.
03 -
Reduce heat to medium. Add diced onion and cook for 15-20 minutes, stirring occasionally, until deeply caramelized and sweet.
04 -
Add diced red and green bell peppers to the onions and cook for 4-5 minutes until tender-crisp. Stir in minced garlic and cook an additional 1-2 minutes until fragrant. Remove from heat and allow to cool slightly.
05 -
In a large bowl, whisk together eggs, whole milk, and heavy cream until combined and frothy. Stir in dried sage, kosher salt, and freshly ground black pepper. Fold in cooked sausage, vegetable mixture, and shredded cheddar cheese gently but thoroughly.
06 -
Pour custard filling evenly into prepared pie crust. Bake at 375°F for 45-55 minutes until the top is golden and a knife inserted near the center comes out with moist crumbs. Avoid overbaking to prevent rubberiness.
07 -
Remove from oven and let rest at room temperature for 10 minutes to set custard. Slice and serve warm or at room temperature.