To prepare the berries, heat a medium saucepan over medium heat. Add ¾ cup strawberries, ¼ cup blueberries, honey and water. Cook and stir until berries are soft and slightly thickened, about 5 to 7 minutes. Add the remaining berries and stir gently to combine; set aside.
To make the whipped lemon yogurt topping, in the bowl of a stand mixer fitted with the whip attachment (you can also use a hand mixer) add the heavy cream. Beat on high speed until stiff peaks form. Add the yogurt, sugar, lemon juice and zest. Mix until combined, scraping down the sides of the bowl as needed.
In a shallow baking dish, arrange five slices of bread in a single layer. In a medium bowl, combine the eggs, milk, yogurt, vanilla and cinnamon; whisk to blend. Pour the mixture over the bread and let stand for 3 minutes. Turn the slices over and let stand for an additional 3 minutes.
Preheat a large skillet and coat the bottom of the pan with butter. Add a few pieces of soaked bread to the skillet and cook on each side until golden brown. While the first batch is cooking, add additional slices of bread to the baking dish to soak, 3 minutes on each side. Repeat until all slices are cooked.
To serve, top the French toast with whipped topping and fresh berries. Serve immediately with maple syrup, as desired. Enjoy!