Cook butter in medium saucepan over medium heat until melted. Once melted, stir often until butter begins to brown and smell nutty, about 5 minutes. Remove from heat and add in pecans, sugar, cinnamon, and flour. Cool and reserve.
In a large bowl, whisk flour, baking powder, baking soda, cinnamon, salt, and sugar together.
Stir in melted butter, sour cream, milk, eggs, vanilla, and apples until smooth. Pour into prepared pan.
Sprinkle crumbled bacon on top of batter, followed by streusel.
Place pan in oven and bake for 30 to 45 minutes or until a toothpick inserted in the center comes out clean.
Optional: Add an extra degree of difficulty (and flavor) by pouring out half the batter in the cake pan, then adding a layer of streusel before adding the final half of batter and another layer of streusel on top--as pictured.
In a large bowl, whisk the first 10 ingredients together. Then dip each slice of bread into the egg mixture. Arrange slices in the prepared dish. Pour the remains of the egg mixture on top. Cover and refrigerate overnight.
Remove from fridge 30 minutes prior to baking it. Preheat oven to 350F. In a small bowl combine the first eight topping ingredients. Spread on top of French Toast.
Bake, uncovered, for 40-45 minutes. Let stand 10 minutes before serving. Drizzle with syrup.