Banana Custard Cobblers

Custard
1 cup granulated sugar
1/2 cup cornstarch
8 large egg yolks
3 cups whole milk
1 vanilla bean, split lengthwise
6 tablespoons (34 stick) unsalted butter, room temperature
1/4 cup dark rum

Topping
3/4 cup all-purpose flour
1/2 cup almonds
6 tablespoons (packed) golden brown sugar
5 tablespoons chilled unsalted butter, cut into pieces
3 bananas, thinly sliced

Custard: Whisk sugar, cornstarch and egg yolks in large bowl to blend.

Bring milk and vanilla bean to boil in heavy large saucepan. Gradually whisk hot milk into egg yolk mixture; return mixture to saucepan. Whisk over medium-low heat until custard boils and thickens, about 3 minutes. Remove from heat. Whisk in butter and rum. Cool slightly. Discard vanilla bean. Cover with plastic and refrigerate until cold. (Can be prepared 1 day ahead. Keep refrigerated.)

Topping: Blend flour, almonds and brown sugar in processor to mix. Add butter and process, using on/off turns, until coarse crumbs form. (Can be made 1 day ahead. Transfer to bowl; cover and chill.)

Position rack in center of oven and preheat to 400 degrees F.

Place eight 1-cup ramekins or custard cups on baking sheet. Divide custard equally among ramekins, using about