Instructions: 1. Prepare the Crust: Preheat the oven to 350°F (175°C). Grease a 9-inch pie dish. In a mixing bowl, combine graham cracker crumbs, melted butter, and granulated sugar until well mixed.
2. Making the Pear Filling: In a large bowl, toss together the sliced pears, granulated sugar, ground cinnamon, ground nutmeg, ground cloves, lemon juice, and cornstarch until the pears are evenly coated.
3. Preparing the Streusel Topping: In a separate bowl, combine flour, brown sugar, granulated sugar, rolled oats, and ground cinnamon.
4. Chill the Pie: Cut in the chilled diced butter using a pastry cutter or fork until the mixture resembles coarse crumbs.
5. Baking: Bake the spiced pear pie cake in the preheated oven for 35-40 minutes, or until the streusel topping is golden brown and the pears are tender.
6. Serving: Serve warm or at room temperature, optionally topped with a scoop of vanilla ice cream or a dollop of whipped cream.