Gluten-Free Apple Crisp

Substances:

5 cups sliced peeled pink apples, much like McIntosh, Empire or Cortland (about 3 huge)
3 tablespoons gentle brown sugar plus 1/3 cup, divided
1 teaspoon vanilla extract
1 teaspoon floor cinnamon, divided
½ cup gluten-free all-function flour
½ cup gluten-free rolled oats (search Ingredient Repeat)
⅓ cup chopped pecans
⅛ teaspoon salt
4 tablespoons cool butter, reduce into runt pieces