"Create a beginner-friendly gluten-free buttermilk waffle recipe using gluten-free all-purpose flour, sugar, baking powder, salt, a safe substitute for buttermilk, butter alternative, and eggs. Make it quick and easy, suitable for a household of 3, with minimal processing and low-inflammation friendly ingredients. Exclude gluten, dairy, nuts, shellfish, soy, sesame, and corn. Use imperial units only. Include clear ingredient amounts, simple steps, and note a good buttermilk substitute that fits the restrictions."