Better Than Mom's Brown Butter Rice Krispie Treats

Bahan-bahan (24 porsi)

• 1 stick (8 tablespoons) salted butter
• 10 cups (two 10 ounce bags) marshmallows, homemade (recipe below) or store-bought
• 1/2 teaspoon vanilla extract
• 1/2 teaspoon flaky sea salt
• 9 cups brown rice krispies