In a large bowl, combine the flour, brown sugar and salt. Cut in butter with a fork or pastry-cutter until crumbly. Spread mixture into a greased 2 quart baking pan. Bake at 350° for 15 minutes or until light brown.
Meanwhile, drain the peaches and reserve juice in a small saucepan. Stir in sugar and cornstarch until smooth. Bring to a boil. Cook and stir for 2 minutes or until thickened. Remove from the heat; stir in peaches. Pour peach mixture over crust.
For topping, combine the oats, brown sugar and flour. Cut in the butter until crumbly. Sprinkle over filling. Bake at 350° for 25-30 minutes or until golden brown and bubbly.
Let stand 5 to 10 minutes to cool slightly then serve in individual bowls. Top each serving with a scoop of ice cream. Enjoy!