Preheat the oven to 350°F (175°C). Grease a 9-inch springform pan with cooking spray.
In a medium bowl, combine the flour, sugar, butter, and salt until the mixture becomes a dough. Press the dough firmly into the bottom of the prepared pan. Bake for 15-18 minutes or until golden brown.
In a large bowl, beat the cream cheese, sugar, flour, and vanilla extract until smooth. Add the eggs one at a time, making sure each egg is completely incorporated before adding the next. Stir in the crushed cookies.
Pour the cheesecake mixture over the baked crust, and smooth the surface with a spatula.
Bake for 45-50 minutes or until the edges are lightly golden and the center is set.
In a small saucepan over medium heat, combine the brown sugar, butter, and heavy cream. Cook, stirring occasionally, until the mixture becomes bubbly and thickens, about 5-7 minutes. Pour the toffee mixture over the cheesecake and top with the crushed toffee candy.
Cool the cheesecake completely in the pan on a wire rack, then refrigerate for at least 4 hours before serving.