Best.Ever. Apple Bars

Ingredients

• 1 cup Butter, unsalted, melted
• 1/2 cup Granulated White Sugar
• 1 teaspoon Vanilla Bean Paste
• 1/2 teaspoon Salt
• 2 cups All-Purpose Flour
• 5 Large Apples, mix of Gala and Granny Smith. Peeled (optional) and thinly sliced
• 4 tablespoons All-Purpose Flour
• 4 tablespoons Granulated White Sugar
• 1 1/2 teaspoons Ground Cinnamon
• 1 teaspoon Nutmeg
• Dash All-spice
• 1 cup Old-Fashioned Oats
• 2/3 cup Brown Sugar
• 1 teaspoon Ground Cinnamon
• 1/2 teaspoon Nutmeg
• 1/2 cup All-Purpose Flour
• 1/2 cup Butter, cold and cubed
• 1/2 cup Apple Butter