1In small bowl, beat Bisquick mix, milk, melted butter and 2 of the eggs with wire whisk until blended. In 6- to 7-inch skillet or crepe pan, heat 1 tablespoon butter over medium heat until bubbly. For each crepe, pour 2 tablespoons batter into skillet. Immediately tilt and rotate skillet until batter covers bottom. Cook until light brown. Run wide spatula around edge to loosen; turn and cook other side until light brown. Stack crepes with waxed paper between each; keep covered.
2In medium bowl, beat remaining 6 eggs and the whipping cream with fork or whisk until blended. Stir in cream cheese, 1/4 cup of the onions, the salt and pepper. In 12-inch skillet, heat 1 tablespoon of the butter over medium heat just until it begins to sizzle. Add egg mixture; cook 3 to 4 minutes, stirring frequently but not constantly, until eggs are thickened throughout but still moist.
3Spoon 3 tablespoons egg mixture in center of each crepe. Sprinkle with bacon. Fold sides and ends of crepe over filling to form rectangle. In same skillet, melt 1 tablespoon butter over medium heat. Add 5 blintzes, seam side down, to skillet; cook 1 to 2 minutes, turning once, until golden brown. Remove to serving platter. Repeat with remaining 1 tablespoon butter and 5 blintzes. Sprinkle with Cheddar cheese and remaining onions.