Prepare fruit: Wash berries and dice larger fruits. Hull and slice strawberries if using.

Cook compote: In a medium saucepan, combine fruits, honey, lemon juice, vanilla, and cinnamon. Cook over medium heat for 5-7 minutes, stirring gently until fruits release juices.

Thicken: Stir cornstarch mixture and add to fruit. Cook for 1-2 more minutes until slightly thickened. Remove from heat and set aside.

Preheat waffle iron: Heat according to manufacturer's instructions.

Mix dry ingredients: In a large bowl, whisk together flour, oats, brown sugar, baking powder, salt, and cinnamon.

Prepare wet ingredients: In another bowl, whisk egg yolks, milk, melted butter, and vanilla until combined.

Beat egg whites: In a clean bowl, beat egg whites until soft peaks form.

Combine batter: Pour wet ingredients into dry ingredients and stir until just combined. Gently fold in beaten egg whites - don't overmix.

Cook waffles: Pour batter onto hot waffle iron (amount depends on size). Cook according to manufacturer's instructions until golden brown and crispy.

Serve immediately: Top warm waffles with fresh fruit compote and serve right away.