Cheesy Cherry Tomato, Winter Greens, and Caramelized Leek Quiche - Witten Kitchen

Ingredients

• 1 round pre-made, frozen pie crust (I love the 365 Day Brand vegan version from Whole Foods)
• 4 large eggs
• 1 Tbsp. ricotta cheese
• 1/4 cup shredded white cheddar cheese + more for sprinkling on top
• 1 1/2 tsp. salt
• 1 large leek
• 1/2 white onion
• 1/2 Tbsp. olive oil
• 1 tsp. agave
• 1 cup packed fresh swiss chard leaves or another leafy green of your choice like spinach or kale
• To Garnish: chopped basil and more cheddar cheese