@ossobuco,
I have my moms 1973 printed Joy of cooking .. here is soufflé recipe from it that sounded like what you asked for…
BLENDER CHEESE SOUFFLE
4 to 5 Servings
A somewhat firm but acceptable soufflé.
* To prepare baker, please read About Soufflés, above.
Preheat oven to 325°.
Dice into cubes:
6 oz. sharp cheddar cheese
Heat to just below boiling:
1½ cups milk
Pour the milk into blender container and quickly add:
2 tablespoons butter
6 to 8 pieces crustless bread, torn into large pieces
½ teaspoon salt
⅛ teaspoon pepper or a few grains of cayenne
(⅛ teaspoon mustard)
Blend until thickened. Add the cubed cheese. Beat in a large bowl until lemon colored:
4 egg yolks
Add the blended cheese mixture very slowly, beating constantly. Beat until stiff, but not dry and fold in gently:
4 egg whites
Place the mixture in a prepared 8-inch soufflé baker and bake about 50 minutes or until set.